So you want to be a blacksmith, but you don't know where to start. That was my problem when I first got into this wonderful hobby. I didn't think I could afford it and that I needed a huge shop with an anvil the size of a small car so I could forge a sword that could cut through a cinder block (just messing with you). Though I did think it was going to cost an arm and a leg to get started, I was wrong.
All you need to get started is, something to heat your work, something to hold your work, a thing to put under your work, and something to apply force to your work.
The thing to heat your work, or better known as a forge, can be a simple hole in the ground with some kind of bellows to supply air.
The thing to hold your work would be a vice of some kind just to start with, until you find a good post vice.
The Thing to Put Under Your Work can be as simple as a rock or a hunk of steel / RR track, if you can not afford an anvil.
The thing to apply force to your work would be a hammer, though it can not be just any hammer (no claw hammers allowed), but a second hand cross pein or ball pein hammer will do the job.
The rest of the tools, like tongs, can be made with just the ones I listed to get started. Yes I said making tools, this is one of the best (and cheapest) ways to grow your tool collection and hone your blacksmithing skills.