Replying to Backflip Dilemma

So I have been wanting to learn backflips for a few years, (tried one three years ago but fucked my back so bad i didnt ski for a week, hadnt ever done one on tramp so idk what i was thinking) and I really want to get one this season, preferably on a park jump. Im scared, and ive only done a handful on tramp this fall. I also really want to learn flatspins and corks, but i think I should learn a backflip first. Should i just go for flatspins/corks anyway or learn backflips, & do i need to practice more on tramp before trying them on a park jump?