as far as your gun goes... id keep it simple... get some turkey targets(I like primos) and take a shot from a good rest at 20,30,40 yards and see how many hits you get in the out lined vitals (skull and neck vertabre)... with the set up you got your prob be good out to about 35 yards... buying chokes and shells can get pretty expensive lol... you'll hear a lot of different numbers of hits that "people" say is the minimum number of hits in vatals... I've always went with 5 as the minimum... as far as gear goes id recommend a turkey vest to help organize your gear... just keep at it and learn as much as you can before season opens...

also Winchester has a new turkey load (LONGBEARD)out that patterns pretty darn good id give em a try...

your definetly going to hear the "experts" push the hevi shot/10" circle... id learn about the wild turkey and how to hunt them first before you get all cought up in the expensive quest for the elusive 10" circle lol

good luck