Hello, Masterdaddy96 --
Those are good questions. Let me try to answer in a way that will help you both with the use of those incenses and with Spiritualism and talking with the dead.
First, you will need a charcoal disk on which to burn resin incenses such as Gum Arabic and Dragon's Blood. They are twoo dense to burn on their own under normal circumstances. You will need a heat-broof incense brazier or pot and it should be lined with clear sand. You may prepare it first by copying out a verse from the Bible on the subject of incense, burning the paper to ashes (this is your hand-copy, not an actual Bible you are burning), and rubbing the ash inside the incense brazier, then pouring in the clean sand.
Light the charcoal and when it is glowing (just like at a barbeque) slowly drop onto it crushed fragments of the resin.
Smoke will arise and you should observe the smoke. It will often (not always) reveal faces or shapes of spirits. If it does, speak to them. Always test the spirits to see that they are of God and goodly in nature. The Devil can mimic the dead, so be careful.
If you see no images in the smoke, don't worry. Just ask for the one with whom you seek contact, by name, to appear to you in voice if not by sight.
Most people cannot contact the dead directly, but they do see spirits in the smoke or hear their voices. Ask any spirit whom you contact to go and bring back to you the spirit of the dead one with whom you wish to converse. Many Spiritualists report that they cannot contact the dead directly, but that they see Spirit Guides who offer to bring you the one you want as a service to the living and the dead. They will bring the one whom you seek.
I personally prefer a mix of four gum resin incenses for this type of work:
Myrrh or Copal Negro (Black Copal)
Frankincense or Copal Oro (Golden Copal)
An equal-part mix is fine.