Casting is a little more involved than this!
Look at your Lee mold as the affordable mould. If I were starting to cast, I would go the poly coated route. First, get a dedicated toaster oven (used only for baking the coated bullets), a Lee sizing die, and some poly coating powder from Harbor Freight. Your start up investment would be about $70, depending on your shopping methods. You can buy ingots online, or you can use clip-on wheel weights. A casting furnace can be expensive, consider using a melting pot, a ladle, and a Coleman-style (white gas or propane) camp stove, something you may already have.
If you do polycoat your bullets, don't drop them in cold water (called quench casting), just drop them into an old towel to let them cool.
If you cast, make sure that you do it outdoors!