Welcome to turkey hunting. A box call is probably the easiest to use, yelp.
If u get a pot call, slate call, they are fairly easy with a little practice. A pot call
Is also good for yelps, but great for clucks and or purrs and cutting.
Practice the mouth call in you car while driving. Try and work on the basic calls you
Will need. I would learn a yelp 1st and the some cutting. Next is a cluck, which is just
A softer cut. The main thing that you are already doing is scouting. Find where they roost,
And where the head after they fly down. Then just set up in between those spots.
Unfortunately it is trial and error. I and every other hunter have had to learn things the hard
Way. Just store the good and the bad and learn from it. Try not to repeat your mistakes.
But remember every bird is different and may do different things on different days.
Good luck and enjoy.