If you can go on a weekday and early, you get the most game time
You should definitely order tickets online and check in on time. They will lock the front door when they are full even if you have tickets already. You must check in so they will let you through the side door. The lines for the games aren't that bad, 10 minutes or so when they are not full.
Depends on the game. When I was there, the busiest one had a wait of maybe 15-30 minutes and a bunch you could hop right on. On the plus side, you don't have to stand in line, just check in then go grab a drink while you wait!
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