You can definitely stalk turkeys! I do it when I need to and got my biggest long beard that way, just stay back and move slowly running when you need to but you must have cover and like my best bird if you end up having to stalk the whole flock for that gobbler you have to watch and keep track of all those turkeys and where they are looking.
As far as calls you don't have to be very good to call a gobbler you just have to call in the right place at the right time, all you need is to know the yelp to bring in a gobbler. Yelping alone will not bring in all turkeys so it's best to learn them all, I use many calls.