Hi curiosity - ah yes, white candles dressed with Blessing oil are also a good idea. When I just start a new working, or have to do some extra work on a situation, I have these white candles set besides my main candle as well and pray that things will be off to a good start/get the needed boost.
I also suggest you add cinnamon powder, sugar and chamomile to your money drawing work. Good for drawing and also protection of your money.
As for how I read the candle flames and stuff - oh, it's fairly simple. I work these road opening, success and money drawing candles on a regular basis, sometimes on separate days or in one go on Sunday morning. Esp. when I work them together, say the success candle might have a obviously higher flame and during the week I tend to get good news in that area, like I get a call/invitation to do something from a professional contact. Or the green candle burns really bright and I get news about a possible grant. Also, sometimes the flames go a bit funny the whole time, like there's a strange draft even though I have all the windows closed. That for me tends to mean interference, or that there's still a lot of tension/pressure surrounding the situation and it won't clear up quickly. Once you work this consistently, you can just tell.