Watch videos and listen to them call, then try to imitate what they do. Sometimes they will explain why they use a certain call, try it and see if it works for you. As for a shotgun shoot something you are comfortable shooting. No need to go and buy a $1000 gun for turkeys, it only takes 1 pellet to the head. Myself I shoot a mossberg 835 ultra mag with 3 1/2 shells. Do I need them? Probably not but if my gun chambered 4 inch shells I would shoot them too. Practice your calling and don't be overwhelmed with all the different calls, find one that is easy for you to use not what the pro's use.