what do I do during training camp?

Hopefully you are 60 players... No more or the AI will cut the average.

Other than that, absolutely nothing. You will want to check your rookies progress overview to see if they are going to boom or bust.

Just change the drop down box on your team homepage to "Progress Overview" and you can sort the EXP column to get all your rookies together.

Pray.

If you have a good camp, go buy some lottery tickets.