if ur really horrible, i would suggest playing with bots at first whlie looking at guides, then after u actually have basic accuracy and movement go online and find new tricks and stuff.
here ill give u one of mine.
in CTF bespin, when u have the flag, and the enemy does too, get some det packs and put it on the high bridge, and put like 2 or 3, then detonate it. u can do this many other ways. ull take alot of damage so armour up. but ull land on the pipes way up on the top of the level if u position the det packs right. most ppl will not know where u are if u don't let them see u fly up. u might wanna be light since protect will allow u to survive the det packs. heal ureslf before comin down and roll to avoid dying.