all the basics, 4-link, bridge notch, 4 bags, 8 valves, compressor, tank, air line, probably drop lower controll arms, switches. The ways of doing this are nearly unlimited, choose the parts that you want to run, that will work for your application and budget. I would suggest looking at suicidedoors.com to get started.
Wow, where to start? You really do need to figure out what you want to get out of it(best ride or having fun, fast switches and mad sides?)? What kind of loot can you drop on it? and how low do you wanna go?