Casting can be a chore or a joy. It all depends on your personality. Me, I enjoy it, and I find it to be a relaxing hobby. Plus I shoot a lot of rifle ammo so it does save me considerable amount of money. But if I was only shooting 20 rounds a month then I wouldn't bother. One nice thing about it is, if you are just starting out and cast a bunch of lousy looking bullets, you can toss them back in the pot and start over.
And MMCSRET's suggestion is a good one. Read everything you can about it in the various forums and pick up a copy of the Lyman's Cast Bullet Manual and read that as well. You might be able to get a copy at a library.
Then if you are still interested start looking for sources where you can scrounge or buy lead. But don't melt it all down together until you come back and ask about how to tell zinc from lead. That is because if you mix the two you wont be able to cast with bullets with it.
I think if you read enough and take your time you likely will get into the casting, but it's wise to really know what it is all about before you spend a bunch of money. It's cheaper and easier to simply do it right once!