I have been wanting to try some inverts but I'm not sure what jumps to try them on obviously a backflip jump needs to be Mickey but what size also front flips?
My first front was off of a cat track and my first back was off of a snowbank. It really doesnt matter what you do it on just make sure you are confident.
Trying into powder first is always a good bet, that way you can get the feeling of the trick without having to worry about those firm park landings.
As somebody above said, boosting off the side of a cat track is a great spot for front flips since the takeoff is flat. For backies you want something poppy. Find a nice wind lip or build a booter.