Merlin,
You wrote,
"I soon got worried about the best way to be respectful of the Hoodoo tradition."
Worrying is self-handicapping in all magical, social, and career situations, but respect is a highly positive value. So, leaving your worry behind, let's consider respect;
Hoodoo is an African American form of folk magic. To respect it, you must acknowledge its cultural nature and its history. Perhaps an analogy will help you understand. You are a Canadian. In Canada there are long-standing cultural groups with origins in France, England, Scotland, Wales, and so forth. The cultures, food-ways, festivals, legends, dances, songs, musical instruments, folk religion, and folk magic of those who descend from the gold miners of the Fraser River are different than the same cultural touchstones of those who descend from the fishermen of Newfoundland or the wheat farmers of Alberta or the fur trappers of Quebec. Respect is acknowledgement and upholding the historical culture-bearers (by name when known) and working in the ways that they taught.
The same is true of African-American culture. Respect consists of learning the food-ways, festivals, legends, dances, songs, musical instruments, and folk magic of African Americans, acknowledging and upholding the historical culture-bearers by name (when known), and working in the ways that they taught.
Familiarize yourself with historical African-American rootworkers, herbalists, and conjure doctors like Paschal Beverly Randolph, Mother Leafy Anderson, Jim Jordan, Myrtle Collins, Dr. E. P. Read, Black Herman, Dr. Buzzard, Aunt Caroline Dye, and more. Find their biographies here -- click the links to see them and learn about them:
Celebrated Mediums and Conjure Doctors at the Association of Independent Readers and Rootworkers
https://www.readersandrootworkers.org/w ... re_Doctors
If you respect others, they will respect you.
You then wrote,
"I don’t want to use practices that I haven't been given the permission to use, with the history and the risks around cultural appropriation or colonialism/imperialism.
Let's break that down into two parts: (1) "given the permission to use" and (2) "with the history and the risks around cultural appropriation or colonialism/imperialism."
Part (2) is negated because (A) you are not personally a "colonialinist" or "imperialist" and (B) once you have respect for a culture, as outlined above, you will not engage in "cultural appropriation" because you will not claim origination of something you did not originate.
Part (1) is a more complex consideration, but only if you believe the idea that people have to be given "permission" to learn about or to practice the public food-ways, festivals, legends, dances, songs, musical instruments, and folk magic of a culture they were not genetically born into.
Before 2013, a Greek woman could learn Chinese cooking, a Black American man could learn to play the blues on a German harmonica, a Vietnamese boy could pan for gold on the Stanislaus River, an Irish man could play Black boogie-woogie piano in London, a hippie woman of Anglo-American descent could become a weaver in a Mayan village in Guatemala, a Norwegian fiddler could learn to read ancient Sumerian religious texts, a Swede could take up English Morris dancing, a Christian could study the Jewish Kabbalah in the original Hebrew, a Scotsman could practice Hatha Yoga, a Texas man of Mexican descent could play Czech polkas with Spanish lyrics on a German accordion, and a French-Canadian named Merlin could study hoodoo -- and if they respected the people within the culture they were upholding, they received respect in return, and no one had to seek "permission."
Around 2015, the previously unregulated sharing of music, recipes, and dances began to be questioned. The Chinese soprano could still join the Sextet from "Lucia di Lammermoor" -- but gatekeepers from some cultures began to bar the door when it came to specific cultural totems, and skin colour became a litmus test for these gatekeepers. Black Santa? White Santeros? Black Jesus? Dravidian Wiccans? Swiss Quimbandans? Native American Muslims? People drew lines in the sand. By 2017 friendships crumbled as "other-skinned" or "other DNA'd" people were no longer welcome in certain covens, congregations, clubs, and cults. Some gatekeepers posted implicit warnings: No Blacks in our version of Asatru, no Whites in our version of Palo Mayombe. No Indonesians wearing Scottish kilts and playing the bagpipes in Nashville. No Jews making mojo bags. No Latinos singing barbershop harmony in Wisconsin. No Nigerian rune-casters. No Iranian line dancers in cowboy boots in our bar. No Yesidis in our Islamic nation. No Algerians in our neighborhood church.
Who do you think is authorized to "give you permission"? Surely not the self-appointed gatekeepers who promote the bold claim that hoodoo folk magic requires "initiation," as if it were a form of ceremonial magic, Freemasonry, Neo-Paganism, shamanism, or an African diasporic religion. Surely not those with little knowledge of history who are trying to bar White European-Americans from practicing hoodoo while still using European herbs like Mint, Rue, Hyssop, and Queen Elizaebth Root in their mojo bags.
Yes, anyone may claim that they, and they only, have "permission" to practice hoodoo, but who granted THEM "permission" to enjoy the benefits of German beer, Irish Catholic saints, North American herbs, Spanish guitars, Japanese silk kimonos, Central American red peppers, Jewish Psalms, Pacific Island coconuts, Mamluk playing cards, American baseball, Chinese astrology, Babylonian astrology, Persian melons, Indian palmistry, Neapolitan pizza, Arabic numbers, American numerology, Cherokee tobacco, Scottish tea-leaf reading, Indian lemons, ancient Egyptian deities, Swiss cheese, Italian tarot cards, South Asian spices, Caribbean rum, Irish whiskey, Quechua potatoes, Sangoma bone reading, Middle-Eastern evil eye bracelets, Cajun seasoning, European crowns, Sri Lankan cinnamon, British Baptist hymns, Cuban drumming, French sachet powders, and English pit bull terriers? The truth is that hoodoo as we know it would not exist without African traditional magic, European perfumery, Judeo-Christian prayers, American petroleum wax candles, Middle Eastern systems of planetary magic, and a world-wide commercial trade in magical-medical herbs, roots, seeds, and minerals.
Do you see how foolish it is for these gatekeepers to work with world-wide treasures and the indigenous legends, lore, and beliefs which accompany them, and then to claim that their culture's folk magic, which includes many of these freely-shared admixtures from other regions, is a "closed practice" so that if you are not of the correct skin-colour or DNA you must not work with "their" methods, tools, or spiritual supplies?
Show the cultural gatekeepers courtesy, always, but do not ask their "permission" to practice folk magic. They may come to fully embrace and respect the many culinary, religious, mystical, magical, musical, and divinatory gifts that other cultures have freely offered to their culture, or they may not. But that's on them.
In the meantime you are welcome to join those of use who learn from history, practice respect naturally to the original culture-bearers of hoodoo, support contemporary culture-bearers who are willing to share their family magic, and in turn are willing to share our own family magic freely with anyone who asks.
) and I’m from Québec, Canada. 
I’m also not very good with computers and that kind of stuff ! 
