Welcome to the club! Congrats on a great purchase! Steve's right - a couple of dowels, 250 for 4 hours. No need to have the shelves or racks in, or put foil on the bottom. Whole dowels are fine for seasoning.
If I use the hickory dowels for cooking, I do split them down the middle, and put them in flat-side down. I find they smoke better, and use all of the wood.
First smoke - let your time available guide you. If you want "quick," go for ribs or chicken. If you have a day, do a Boston butt for pulled pork. A pork loin is also a good, quick smoke - takes 2 1/2-3 hours. Check out the pork loin recipes under the pork section!
Let us know if we can help! Most of us here have kind of "been there, done that" with our SI's, so answers are easy to find!
Many happy smokes!