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Try and get the jack guy from the other comment to talk about this too because he is going to march with them. But for me, definitely LONG TONES, LIP SLURS AND BREATHING EXERCISES!!! Those are the keys to being a good brass player in general. Start working on finding/practicing your Technical and Lyrical Etudes. Also I have found these things to work well for finger dexterity. It helps with fast passages and things like that.
For breathing do in 4 out 8, in 4 out 10 all the way out to 16. Then in 2 out 4, in 2 out 6 all the way to 10. The do the same but with in for 1. They will teach you more breathing exercises at the camps too.Try to get your hands on a marching euph... that'll be the best!