How do you mean how do you get into it?
At the simplest level, find a show that offers the class, enter turn up and ride
More complicated, work with your trainer, it is quite challenging to fit it all together to start with, and so far I have only done intro level, LOL but I am a champion at that!
I started with a piece of music that fitted G Man, then rode to it for a while to try and make sure that the rhythm matched up OK, then just worked out a routine that fit in with it. I love riding to music now, it makes it easier in a lot of ways, but I need to become more tech savvy going forward, I got blasted for using just one piece of music, slowed down for the walk, byt hey it's a start.