Hi Alexandra,
Abby sounds more knowledgeable than I am, as I don't have a gymnastics background & I am still playing around with my trampoline to figure out how to best utilize it, but I did have an event at mine for our Nelson Chapter & there is a picture of our set-up with the equipment I used & the cost. You can go to the Nelson, New Zealand Chapter blogs I have posted & find it there. I used a bar line set-up a year ago when I was learning the backroll & it helped me get in the habit of kicking my legs over & following with my head. Good Luck. :)
Cheers,
Aileen