running is excellent of course! if you run lil bit now everyday, then when conditioning comes around, you wont be all tired and feel like you want to throw up due to the hard conditioning, you will be in top condition to play ball, work your calves too, it help u jump higher, you can do weight workout with your legs tho
and yes once you start lifting weights, here's my tip, (i dont do hard workouts but i kno a lil bit) always give time to rest between working out on the same spot, at least 24-48 hours i think, bak then when i started working out, i would do the same workout every single day without giving it time to rest, i did that for a few months and yes i did get bigger, muscles grew but not that much, then i stopped working otu for like a month or 2 cuz i got lazy, i recently started working out for about 2 months now, i do different workouts every day, avoiding the area i just work on the day before, then the other day, i met my cousin which i hadnt seen in about 4 months and my cousin told me that i got really big now, then i realize that my new workout plan is going great and now im continuing it and see much more improvement than before
good luck with ur workout though