First thing would be to try a new/charged battery.

There are lots of suppliers for new parts, here are a few:
National Parts Depot
Classic Industries
Ames

Also this site is very helpful, there’s lots of information:
http://www.firstgenfirebird.com

Good luck and have fun!

Though your distributor is getting voltage it may not be producing spark when the engine is cranked. Take a plug wire off any spark plug (one easiest for you to get to) place a used plug in it the wire and lay the plug on the engine where it is getting some ground and where you can easily observe the plug. Have some one crank the engine. If no spark the problem is in your distributor. Make sure there is a rotor in the distributor. A few things in the distributor that can produce a crank and no spark. Faulty ignition module, pick up coil, and or the coil. These last three I mentioned any one of them will cause no spark. The cap, wiring, voltage and coil button are things you can check easily. Just make sure you havent hooked the power wire to the tach side of your coil if the wire connectors have been replaced for any reason.