It is easy to be overwhelmed by the number of discs on the market. You really only need 3 or 4 different types(molds) of discs in your bag...tops. My advice to new players is to find a putter, midrange, and understable driver and get at least 3 of each(the same mold). Putters all the same weight, and vary the weights on the mid and driver. Then practice, practice. By having multiples of the same disc you can develop muscle memory much quicker than if you have to throw a drive then go pick it up, or switch molds every throw. You can experiment by buying the same mold in different plastics and seeing what that does for you, but resist the urge to try new(different) discs- there is no magic bullet for becoming a more accurate player.
As a new player you will find that your second shot is often ~100ft from the pin, so practice this distance, alot. Go to a park and practice throwing at trees about 100 - 150ft away or play catch with a friend. Do this often and you will find your self with a lot more pars and a lot more confidence. The distance from the tee pad will come with time, but a strong short game and putting will make you competitive with players above your level. One more thing about the short game is to use the slowest disc you can on each throw- throw your putter from 100ft and you will be punished less by errant shots. This rule applies to the whole game, I feel. Don't throw your driver if you can reach it with a mid-range(or putter).
Denny- You really should work on your backhand or at least a conventional sidearm shot, the forehand roller is more of a specialty shot and you will find yourself limited on most courses if that is all you can do. Follow the suggestions above. I cannot stress enough the importance of practicing, alone away from the course, you will improve so much faster than if you only play rounds of 18.