Here's a guide I found useful for setting the capacity per level. Ticket prices is trial and error. Keep adding +1 or +2 per game and when the attendance falls below maximum you know to knock -1 off.

L1 - 800


L2 - 2,500


L3 - 6,000


L4 - 11,500


L5 - 19,000


L6 - 28,000


L7 - 40,000


L8 - 53,500


L9 - 69,000


L10 - 86,500


L11 - 106,000


L12 - 127,500


L13 - 151,000


L14 - 176,500


L15 - 204,000


L16 onwards - 260,000