So many great suggestions!
I'm also certified through Madd Dog & they will tell you to never do anything on a spin bike that you wouldn't do on a regular bike - with the exception of standing for more than a few pedal strokes. Push ups, hovers, etc., are worthless & dangerous.
I really work on getting playlists that are diversified & fun. People won't come back if it is drudgery. Keep it safe, make sure you work sprints as well as hills and always include a short recovery song - or part of a song - after a particularly difficult climb or sprint. I have my songs and what I'll do on a piece of paper that I can refer to. Watch your audience. If they're getting tired/not challenged enough, you may need to change on the fly.
I do use the 1-10 perceived exertion and remind my people that it isn't a number on the dial - it is how they feel. As the class progresses, be sure to remind people to watch their form because it usually starts to go south as people get tired.
As Tulip said, tie the cadence to the music. It makes it MUCH easier, although it will take work on your part to research the music. I always practice the session before I present it so that I know it flows well. Very often I'll need to make changes because what looks good on paper doesn't work.
Smile, make eye contact and remember this isn't your workout - it is their workout.



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We DID have another instructor who used either that or syrupy icky 70's disco <shiver> I avoided her class, though for more reasons than the music.
She was super supportive when I told her I wanted to try to become an instructor and helped me along the way. 
