Read all you can here and elsewhere. Do your homework! And then get out there and practice what you have read. Yes ,you will make mistakes but that is how we learn. But you certainly can learn lots of basics from the excellent turkey hunters who have posted their thoughts on this forum.
Pick up some Real Turkey Voices cds and practice using your call(s) of choice. Start with a box or pot call. They are the easiest to master. Learn how to make the simple "Yelp". That is really all you need. You don't need to be a Turkey Calling Champion and quite frankly a real turkey sounds no where near what those guys do. Learn to mimic what you hear in the wild of the Real wild turkey will help you call more birds in. So practice.
There is no sure fire method that will work everytime.
There is no secret decoy that will being them in every time and
there is no one shotgun better than any other.
What you need to learn is how to pattern and how to determine your effective range. Then you need to develop a set of woodsman skills. That being said learn how to blend in with your surroundings and how to step lightly. Knowing when to move and when not to move is the key to baggin a turkey. Goes along with when to call and when not too........And all of that is learned through trial and error as we hunt.
So get busy.... and read.
JW
And, I expect to make a few mistakes again this year and I have been turkeyhunting over 25 yrs now!