I commented on your other thread before I found this one. There is a young Englishman, Alec Steele. You may be familiar with him from youtube. He has online classes. One of them is $30 US. I bought it. In the class, he gives some good pointers to be up and forging for around $100. I mention this because of the anvil.
To start off with, you simply need a flat surface. If you can scavenge or buy an inexpensive chunk of round stock that is flat on one end, it will get you started. Of course, if you continue in the craft, you will want to move on to a better anvil. Also, you will put dings in this first anvil as you learn to forge. You would much rather put your "Learner's" dings in this mild steel junk anvil than an anvil that you have saved lots of hard-earned money for.
Forges: I didn't think about a brake drum forge until I was reading this thread. But that would serve to get you started as well. As for the effects of wind, that is going to be a problem without a dedicated semi-enclosed work area. Trust me, this particular problem plagued me for years and still does if the winds are high enough. But as I mentioned in the other thread, I will get you the measurements for my bottom draft firepot when I get home from work tomorrow. That way you will have options. Hope this helps.
Edit: On an interesting note, I noticed that I have 2008 posts and I've been on the forum since 2008.
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Ichthean Forge (pronounced Ick thee an). Maker of knives, and primitive camping gear.