Looks like you've already started. The thing I would suggest is to keep in mind that luxury boxes and courtside seats are ones that are most likely to be consistent for you - if you find the right price, you'll be able to rely on selling a regular number of them most of the time. Bleachers and lower tier are more dependent on winning -- if you're going to be winning, and especially if you promote and get to leverage a promotion bonus, those seats can really be profitable. In any case, keep putting money in your arena when you can, and it'll pay off for you in the long run. Good luck!