If you want to invest, then you need money to invest. So first start with that. To get money, you don't need to do anything with real estate, any old job will do, as long as you save most of your money. This is what I, and most other small-time investors did/do. I had jobs in unrelated fields that I was good at, and saved my income to invest in rentals. Then I bought some and collected rent.
Others will mention various odd-job things you can do to earn money, like bird-dogging and whatnot, but that's probably not your personally best way to earn money, so mostly a waste of time. Although there is some educational value in working in RE, so take that into account.
At a high level, it's no more complicated than that. The details would fill many books, and indeed do. You should read some - I did.
So to answer your question, my story:
1. Earned and saved as much as I could, in an unrelated field.
2. Read a lot of books and web sites about RE investing.
3. Talked to people about it.
4. Bought some rental houses.
Good luck!