Take a look at the arenas in the IPBL. They are all more or less similar. Because you are still in Div. 2 you have time. Build whatever you are selling out of in a phased manner.
On another note, you need a few more players. I would not try to promote too fast. There are three tough teams in your Conference. Rather buy a decent trainee and train him. You already have Venkatasami Kumar who would be great if he weren't 19. You should be able to get a superstar for relatively less in a week or 2. You'll beat most of the teams with your current roster.