Pick your profession, stick to that
go farm a bunch of shit, figure out what people are willing to spend, put all of it on the ah, use appraiser to start.... after you've got some cash you can start buying out under cutters instead of waiting for other players to buy them out, then resell them. learn peak hours for your server, all that.. once you get good you can expand and buyout undercuttters in other stuffs and resell at a higher price.