If you dont want to use real money you can do the 500, 750, and 1000TC tourneys for starters. There is also the GMTourneys and such like that that are like 10k/5k 7k/3k. Once you get maybe 5-10k you can start marketing and hope you can find/get good deals and profit from that, will most likely start off kinda slow though. There's also dueling and betting, there is almost always a betting server up ingame (Usually globalled ingame). Dueling I guess is for more 'advanced' players who like the risk or I guess know they can win. And the other obvious choice is your own moolah $$$. Most people sell that now for 7k/$ to sometimes 9k/$. I would say the /easiest/ choice would be marketing. Just my opinion.