You will start by upgrading leap strike and you will usually solo a lane, so what you do is that you consistantly use leap strike on the enemy in your lane to scare him and take of damage and after u leap strike on them u use empower immediatly than dodge so u can stun them, if you are getting owned in the fight then run after u stun the enemy and leap strike on a nearby ally or minion to make a hasty escape. also after u buy the first six item then sell beserkers greaves for guardian angel. also u will be very squishy so make sure u just leap strike in to a fight then run as soon as ur HP gets low coz that will be fast. minions will die very fast from you and u can use ur skills on them like empower and leap strike as long as u make sure ur mana doesnt get too low that u cant fight because jax's mana will run out fast

i hope u like my guide =D