Is there some sort of Beginner Guide ?
I have no idea how to get Money/train. :/
I'd honestly like to help, but I treated the game like a sandbox and just massively cheated up my cash, so I don't have a clue how to actually play this one seriously. Maybe early on an Arcade with a few trash-tier slaves in it would generate some revenue? You could also scrounge in the market for slaves with decent sex skills and just have them start whoring (set that as their job in their individual screen).
What I can say is that you might consider, if you don't have it already, getting the latest pregmod (continuation of the abandoned game) from the gitgud.io link floating around in the thread. Lots of new options in there and improved visuals for the slaves, too.
I'm sure you can do it in the older versions, but in the newest ones you can set a particular slave to get "personal attention" from the bottom of the main screen. At the end of a turn, your character will spend time trying to fix problems like disobedience and bad traits and whatever. When you have facilities like the school built up with a decent leader, they'll try to do that stuff, too.
Um... other than that, you can try this
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wiki I found. The in-game help might have some suggestions for starting out, too. Other than that, I can't think of any guides I've seen.