With early game you want to just to last hit the minions. if the enemy jumps on you you should E, AA Stun from E and watch them hate that harrasment.

Jax is pretty decent at backdooring so you should do that for CS and annoyance and if they try to come kill you go back to a bush before they come to think you went back and then continue backdooring after they leave

here you should be pretty fed from all that CS from backdooring. Just jump in the fight when its initiated from your tank. REMEMBER to try to go for the carries. your so don't worry too much about dying too quickly. ult every team fight.