Wow, you're in for the ultimate challenge my friend.

Yes, a blind will be better than just a brush pile. Reason being, in a blind, you're back inside it in the shadows. With just a brush pile, the sun can still get you noticed when you go to draw your bow. It can be done, but it's much more difficult. Especially if you have more than one bird come in. It's darn near impossible to draw a bow without being seen by at least one pair of those eyes.

Have you ever turkey hunted before? If not, I'd suggest you get a few successful hunts under your belt with a shotgun prior to using a bow. It will teach you things that will help you alot when using your bow. Dang birds are difficult.

Point of aim? Where the wing attaches to the body, or just a little low and back of that point. Very small kill zone. Also, if you're using standard broadheads with nothing on them to slow down the penetration, be prepared to get out of the blind and chase down the turkey before it gets a chance to go airborne. If it hits the air, finding it will be hard. They make "grabber" devices that go on behind your broadheads that slows the arrow down once in the bird, and prevents it from completely passing thru. This will help in keeping the bird on the ground.

Good luck to you.