Great start !!!
I think you'll be fine on the wood......they're supposed to catch fire....that's an indicator that your fire's hot enough & not just smouldering & producing ugly smoke.........a low smoulder = creosote & sluggish or white smoke burn & eventual bad taste in the food.......
Keep in mind also that if you notice that by opening the lid to look, there's a big rush of air introduced when the lid's off.......just check by watching what's happening at the exhaust vent:
Is it flowing smoothly & forcefully out of the vent?
That shows good, solid air movement, or draft, thru the cooker & you're golden......
Here's the approximate color to look for:
If you get a little white when each piece first catches, don't sweat it.....it'll come out just fine......