Previous software you wrote just went the steam route, Hitech.
It didn't do well because 1) the graphics were dated, 2) the write-up was misleading, and 3) they didn't have the logistical tail in place to support the new steam community.
Hopefully you will do better:) I would also consider a "instant action" arena with a limited plane set....so you won't have guys in zeke's fighting runstangs and uber jugs right off the bat.