In my experience all you need to know is how to yelp and cut. The glass call is easy to learn and one of my favorites, but for close in the mouth call is best.
Decoys... I always take em but only use em half the time.I say take a hen and a simple Jake they will take the attention off of you if you move, and may bring the gobbler in those last steps,but you may not need them.
Find an area where turkeys have been spotted and look for ridges with some somewhat level or less steep areas with water close and look for sign or better yet call with an owl call etc. right at early dark to roost em.
Have fun! and be Safe