Unless you're bowhunting, I'd say the ground blind would be unnecessary. Get your back up against a good sized tree or even heavy brushpile, and you're good to go. Easier to see them coming as well.
Any old decoy will do. Turkeys aren't as picky about their company as decoy makers would have you think. If it looks like a turkey, that's good enough.
A box and/or a "slate" call is easy to learn and you will sound like a turkey right off the bat. Mojotex gave you good advise. Don't call too much. You don't hear the turkeys calling a lot. You shouldn't either.