I don't think it's so much a big deal about the style of cheers, whether it's sideline or chants, as it is getting used to the college style.
The biggest difference I went through is stunting during games. We stunt during every other cheer, pyramids and baskets during quarters and time outs, and you have to be ready for it all. You want to get the crowds attention and have them cheer with you. A lot of the cheers are so simple so people can follow.
I think another big thing is the collegiate "look." Everything you do is sharp and you are always smiling. If you're holding a sign, whenever you move it, it has to hit just like a motion would. Same if you're flying, you need to be sharp and hitting your motion and smiling, even if the stunt is moving underneath you. I'll go watch high school games occasionally and I always notice how sloppy they are, they're standing all relaxed and talking to other teammates about their weekend plans, fiddling with their hair, or god forbid chewing gum. Even though I'm totally guilty of doing those things in high school, in college it's like a sin.