read a guide for lv 50, 60 70 and lv 80 rotas (for single target and aoe rotas).., keep practicing especially the lv70 and lv 80 rotas, till they are fully imbeded in your "muscle memory"..

after that start to do harder content with rdm.. (and don't be afraid to rez players, even if it means u lose dps.., it's almost expected from Rdm's)