It ultimately depends on your champion. Learn how to rotate through your jungle and the enemies jungle to counter and steal their camps. If you're bot side, check for wards and see if you can squeeze in a gank. If not, try to quickly figure out where their jungler is. If you think he's topside, try to steal one of his camps, pop a ward, and then back and rotate topside. Rinse and repeat. If you're able to gank mid successfully, ask your mid laner (if they're still healthy enough for it) to help you run down to bot side for a double kill, then try to take as much of the tower as you can.
Just a few tips from a non-jungler XD If these don't work for you, then just experiment and try to find what YOU think works best