The most important thing is a source of lead. 5 or 10 years ago it was easy to find -- usually free. Now people look at you funny, like your a terrrst or something, if you even ask about it.
If you can find lead (wheel weights are good if you can still find lead ones and you don't get a zinc weight melted in with it, also lead pipe, and scrap flashing), get a Lee 20# bottom-pour pot, and a six-cavity TL452-230-TC bullet mold and a set of handles, and a small-to-meduim stainless steel saucepan from the Salvation Army Store to melt your scrap in. (you don't want dirty scrap getting in your good pot and clogging up the spout)
You can save a little money by starting with a 2-cavity mold if money is really tight. But the 6-cavity molds cast about 4 times faster.