Agathe,
Bran made a great post, it should help you understand the business. And lol at your "hot is an understatement" post...it doesn't matter in development.
I work with a guy who started the real estate finance programs at the top biz school in the US. So his formal education was solid. His Dad was a GC and he grew up swinging hammers and really gets construction.
When i started working with him, I learned the business stuff pretty easily, but it took a while to learn the construction end of things. It might seem too "blue collar" foe a narive college kid with Trump-style goals (that's you), but believe me, if you don't know construction, you're going to get ripped off. Sure, you can hire people who know construction, but, you'll never know if you are getting rooked or not. How does that feel as a biz owner? Not good, sir, I can assure you.
Learn construction. If you want to be a commerical builder, learn how shit is built. it doesn't mean you need a to swing a hammer, but every corporate bank is filled with MBAs from top schools who don't know what a footer is.
Anyway, my partner started buying and fixing houses right out of college. He knew real estate markets, I mean really knew them, studied with someone who was #2 at HUD for a while. But that's formal education, you'll learn all that.
OK, so now you know RE market principles, and you know construction. After that, you just need to learn how these things are financed. That's basically a "learn on the job" experience, because as bran987 might tell you, every job is a little different, and you can't say they're all the same until you;ve seen all the little differences. (Did that make sense?) Sometimes landowners want to participate, sometimes they want to sell land, etc. From the financing standpoint, as an owner, the name of the game is risk reduction.
OK, you want to be a developer. You'll learn construction. You'll learn the RE market. You'll go to work for a developer and see how financing instruments are used for different jobs.
Now you have to learn a few more things.
(1) Patience. Find the right deal. Most developers fail. They ar elike venture captialists, they try to hit a home run every now and then to clear the balance sheet from all their losers. My partner has done over 15 deals and never lost money. he has walked from many many deals, including one here in jacksonville FL to build the developer's dream of housing / retail combined. He thought it was a loser. It was.
(2) Greed is not ego. Many developers are egotistical, and they usually suck. Trump is the most famous of all the ego guys; his developments have been almsot unanimously a failure. He has lost many buildings to avoaid bankruptcy, and really only avoided bankruptcy by threatening to fight his creditors every step of the way.
For the real deal on Trump, do some research about what the pritzker family has had to say about him. The older generations of Pritzkers were the hallmark of wealth and integrity; they're much richer than Trump and have zero respect for him.
it's not about ego. it's about dollars. You need to have ice in your veins when you look at a deal.
So..I think we got most of it, with some help from bran987. You've got a lot to learn, and if you want to be an investor, well, that's another class entirely.