Traperbob one hen decoy is enough and a hen and a jake decoy is plenty.
I don't know what calls you've got but borrow some video on calling to make yourself confident on what you are doing. Next just set up within 100-200 yards of the roast selecting the most open area so you can see what's happening, the more open the better. Answer the first gobble with your hen call. The more he gobbles the more you answer.This is important you are answering him he is calling you.If you keep at it he will come, and he knows where you are even if it is 1 hr. later.