IT-it really is idiotproof with the Masterbuilt. Don't know what model you have, but it really is darn near impossible to mess up. If you need a good resource for recipes, here is a good site:
Dadgum That's Good Recipes Dadgum site recommends 30 minutes per pound at 225* or 18 minutes per pound at 275. I also have Robb Walsh's book Legends of Texas Barbeque. It's a great book, and has lots of history, stories and recipes. (I also have his Tex-Mex book as well.) When I smoke a turkey, I use water, white wine, lemon and rosemary in the water pan. I smoke with hickory or applewood pellets. Mesquite is a bit strong for poultry. Walsh recommends (for a 12-13 pound bird, two hours breast side down at 275-300, then flip (breast up), baste with Italian Dressing, and cook for another two hours. After 4 hours, start checking the temp until it hits 160. I tend to cool low and slow on the smoker, so I would go with 225*. The lower the temp, the less it dries out, and the more smokiness it absorbs.