Hi mate.

So, at first, multiply your manager level by 2. The result will be the price of the League ticket. Add 1 for the Cup, and add 2 for the Champions League/Superleague. (Example: I'm level 4, so, my League ticket starts in 8, Cup ticket starts in 9 and CL ticket starts in 10)

If the stadium gets full capacity, try to add 1 to all tickets and see if the stadium continues to gets full. Continue to do this until you see that you are earning as much money as possible.

If the stadium does not get full, drop by 1 all prices until the stadium gets full capacity.