lol I'm better at tricks while skiing than I am throwing them on a trampoline.
but seriously...there are other threads about this, one very recently. try dub cork 10s first, basically go for the cork 5 to cork 5, one of them will dip a little lower than the other so most likely your first trick will be a cork 630 approximately. when that finishes keep tucked DO NOT OPEN UP IT WILL POTENTIALLY HURT. eventually you'll get the rotation set well enough that you'll come around for a ridiculously corked 450. you won't be able to really feel it out too well on a tramp though, it'll mostly be jump, set, throw, go blind, hope you spot a landmark other than sky and ground, see tramp, land.
for a dub cork 14 (never thrown one just a dub 10) I would guess you just throw it in a bit more of a spin and give yourself a few more feet of bounce. good luck.
for skiing I would guess it's about the same, I dunno they're on my "eventually to-do" list haha.