Visit a local store. Say that you've had expereince in past as a racer. Tell them that you want to start doing freestyle and they will recommend you with the best beginner equipment. You can ofc choose what kind of skis you want, but I wouldn't choose the most expensive to begin with. You don't have to buy jibbing boots either, just start out with your original riding boots. When the guys at the store ask you where you want to mount your bindings, just answer that you want a center stance for riding switch and doing jumps better. Start training on the slopes doing jumps and riding switch, once you getter better you can upgrade your equipment. Good luck.
PS! It's much more fun beeing a freeskier, rather than a racer. ;D