That is awesome
A lot of your money should come from the DDR/Stepmania/ITG kids, as well as a compeditive 2D fighting scene. For casual people, Tekken is a money maker, as are Gun Con games
MvC2 is probably the most popular 2D fighter, I'd say start with that and build to CvS2 and 3s. If you can/want to you can go for Arcana Hearts, Melty Blood and Guilty Gear XX AC
Good luck