Great advice from the_shadow, and to add to that, I'd recommend that you get a good trainer and start training some of your players. Then it'd be up to you whether to sell or keep some of your trainees. In addition to building your arena and buying some solid players, I'd also advise that you invest a little on scouting points and look forward to the upcoming draft. Don't worry about where you are now, it does take time to get to a high level.