Go to lowes and get a relatively straight-grain red oak 1X2, and shave half an inch off the width. Back it with fiberglass drywall tape or denim...don't waste time on something more complicated...with a slightly reflex. Cut the tips down to the desired length and taper them for your nocks. After your backing has cured, set it in the tree and start tillering. Keep the belly flat and use a hand plane to tiller. Don't take off the sides until you start getting under 1/2" thick in the limbs.
After you get a good tiller, put it back into reflex and temper the limbs. Then add a simple riser, sand, oil, give.