Don't listen to rookie he sucks.
Now coming from a PRO at making money I'd advise dueling and ruining bet servers via taking any available decap prize.
I'm going to go along and say that marketing is probably best and easiest for you right now too. The main problem you'll have is that with limited capital your returns will also be quite small but it will grow fast enough.
Then every now and then head to a GMbets server and hope that there are some richfags throwing away cash. Should be easy enough to pick up a bit here and there if you're smart.
Good luck.
In R2R event i started from 5k and made 1.2kk in 3 weeks
Deffinately amrketing is the easyest.
I will try to put toghether a complex marketing tutorial in the future. With what is the best items you should buy and what should you look at before buying an item and many more. There are different types or marketeers out there. It's pretty complex