I'll throw out a disagree with the suggestion of cracking all bottom vents and not just one. I use only one in order to better control mine and find I can fine tune temp just a couple degrees with just the one.
However, like CD I now use an IQue on mine which makes it super easy. In fact, I actually drilled in a UDS style pipe nipple so that I get a direct connect without the canister attachment and it works super easy. The doors I've put foil ducting tape over to completely seal them as I don't use a water pan or a clay pot.
I can easily maintain anywhere from 190 to 350.
The main thing would be, whatever you learn over these first 5 or 10 cooks will, in the long run, be a bit irrelevant. Your pit is going to change after a few cooks. So just chuck some pork butts and fatties on there and run it without having to worry too much about temp and get some wear on it. Then you'll be able to start really working on controlling it.
Neil -- "Easy Bake Master"
NB Bandera [gone to heaven...conveniently located in Long Island, NY]
Rebel 23, WSM A, WSM B, UDS, Easy Bake Oven
Pork Pistols BBQ
MOINK...It's what's for linner.