To perform a burpee, start in a standing position. Crouch down and place your hands on the floor, then jump your feet back behind you. To complete a full burpee, you then lower your chest to the floor and then raise back up again, however for an easier option you do not need to do this. Jump your legs back in and jump up to the ceiling, raising your hands above your head. Again, for the advanced version, you would clap your hands above your head as this forces you to achieve the fullest possible range of motion.
If you can complete 10 in a row you are doing well, advanced exercisers will do well to complete 20+.