go to the doctor first, and ask him whether you can start working out again or not
then, i'd prepare a good routine for yourself, i understand how accutane works and its REALLY ****ty, takes everything outta u. if you don't want to prepare a routine for yourself, find one on this site... work cardio as well always, to increase your stamina and to help your endurance, and keep your workouts short but intense as possible with the most amount of weight you can do RIGHT NOW. eventually you'll get back into it, g luck