Barbara: for casting metals, you're MUCH better off either going through a college, or finding a local artisan. Not only can it be DREADFULLY expensive to get started, it can also be a bit on the dangerous side. Heck... even the jewelers I know who know how to cast don't do their own anymore, but have a "professional caster" handle the chore...
PM me with your rough geographical area, and maybe I can out you in touch with someone (no promises though)