[Debuff]

All those guides are going to tell you pretty simple things that you no doubt already know. It will be things like:
-Play the auction house. Buy low and sell high.
-Do daily quests every day.
-Do all your quests.
-Never vendor something if it might sell on the AH, never vendor it if it could DE well.
-don't waste money buying things you don't need.
-When you farm, farm outside of peak hours.

Things like this are common sense but aren't real fun to do. I can save you $20 right now. . .
It's crappy and no fun, but the best way to make money is to just get out there and do it. There's no secret that will make you rich super fast, just diligence.