The only way to farm without being on a very large scale is buying the equipment used. I don't know any serious farmer who buys brand new equipment unless it is a major operation where he can justify it. My dad always got everything used at auction which I know helped significantly. I believe our tractor is from the 80's but it has held up just fine for quite awhile. It is 4wd and runs great apart from the parking brake not holding lol. He got it for somewhere around $10k.
If you have good hay you can make quite a bit off of it though. If you fertilize well you can make even more. We doubled our hay production one year just by fertilizing and having decent weather. No watering or anything like that, but we are in TN so it isn't really dry here usually anyways.
We also used to let somebody else bail for us and he just got to keep a portion of the hay in return. Never sold much though, mainly used it for ourselves.
An old retired guy that lives near me made a small fortune on hay over about a 5 year span. He had a couple hundred acres, then worked out a deal to lease several hundred more. He put a lot into it to get started, seeded it, fertilizer, weed spray etc, but he managed to get 5 cuttings a year and sold hay to everybody with a pulse. It was very good quality so he made a pretty good bit off of it. He used old beat up tractors for everything and did all the work himself.