We are right next door to you in Villa Rica, and just competed in our first competition last weekend, so not sure how much help we will be, but this is what we did when we were starting to think about it.
Go to http://www.bbqbug.com/forums
and search for the "Award Winning...." Threads. They have one for each meat category, and it takes you on a step by step process of how to prepare and cook the 4 competition meats. Use them as a guide and do a few practice runs at home, practice making boxes, and put pictures of everything up on this forum and ask for advise. These guys are always willing to help where they can.
Feel free to PM me with any questions you may have, and hopefully we will see yall at a future contest.