Always max out VIP boxes first, then Exec boxes, and finally move onto seats.

Don't grow beyond the size of stadium you're likely to fill for your league level, as you'll take a hit in maintenance costs if you've got a large stadium you're not filling.

The ideal time to kick off construction is between 00:30-04:00 (server time) on Wednesdays, as this avoids maintenance on the stand(s) you're developing for next 3 updates.