Normally I run like 3 miles a day, but if I were to run like for 20 minutes at like 7 mph would that be fine or should I not run the same day I have a game?
Yeah at least 10-15 min of cardio...get your heart moving so it doesn't freak out when you start playing...jump rope or something or just do a 10 min jog.
Dont run....it will tire you up even if you dont feel it right away. Get a nice good stretch instead. Warm up spotting for shots or doing a little defensive drill. But stretching is the most important one. If you wanna jog then dont do over 10 mins or you will feel it early in the game.