Howdy Pard,
Goatlips has a great site on casting and pan-lubing. If you Google "Goatlips" you will find him.
I started out with a used Lee bottom drop pot I paid $20.00 for. If you buy lead ingots for casting (Midway USA sells them, perhaps they will ship USPS bulk flat rate) you can forego the whole smelting process which gets the dirt and impurities out of the bulk/scrap lead.
The fired bullets can be melted and reused but you may want to use another pot so the casting pot does not get fouled. If you are using a pot on your stove keep some wax handy and drop it in to flux out the dirt. If you flux the pot you can probably use the ladle and pot method for sure.
I chose to smelt used lead to try to keep the costs down. It likely cost another $60.00 but with Spencer bullets costing 36 cents each, (two years ago), I figure it will pay for itself. I have also found trying to find bullets very frustrating. I waited 3-4 months for some 45 LC bullets. I now have a mold for those as well.
For smelting I bought a cast iron pot at an antique store, I think I paid $16.00 dollars for. I was given some wheel weight lead and bullet trap lead from friends. I tried the side burner on my gas grill, but it did not get hot enough. I found a turkey frying outfit never used at a yard sale for $40.00. The turkey pot burner really gets good and hot. So far I have only cast bullets for my 56-50 Armi-Sport Spencer.
You will also need a steel or cast iron ladle for pouring. I have never tried using a ladle to pour into the mold, but that would be cheaper than buying a pot. (In my case, I bought the pot first since it was a fair deal). The key is to have the lead hot enough to completely fill the mold.
If you use over powder cards, (with a dollop of BP lube under the bullet for BP), you can use the bullets for either Smokeless or BP. DIck Dastadly makes some real good molds for BP that will work just as well with smokeless. I am sure you will hear some good info here.
Good luck, Amigo,
Panhead Pete