Hang around these guys for a while. They can answer questions, and get you started. They also have group buys for things like molds, gas checks, alloy and several members make stuff you'll need like boolit lube, mold handles, flux and other stuff.
Read old posts that sound interesting. You will learn a lot.
I shot commercial cast bullets for many years before I stumbled onto these guys. I started casting about 13 months ago and managed to turn out some good bullets in weights and designs that are simply not available commercially.