Dont attack so much first but at lvl 1 try to kill enemy with empower it doesnt cost much mana and it does half life damage for mages :)
When u got stuff u need u can attack u can do triple kill but no more i think so dont attack when they re all together.And if theres someone who can stun dont attack him specialy panthleon

With jax u can solo baron(the big red dragon monster) but thats nothing special for jax, my friend did painta kill on enemy spawner without hack :) with jax.

The good thing is that u got 3200 life so u re tank and a good health regen so u can wait a few mins and u have health!

Spell vamp is good for jax.Spell vamp is that when u do damage with one ability u get life!Its like lifesteal.And when we are at lifesteal u got lifesteal 2 so u can kill some minions or monsters to heal :).

U got 100 ability power so that helps u when u go gank(team fight at mid) so u can kill enemys fast.

U got 100 armor isnt that cool? and u got dodge too:) im sry because u have just 36% dodge but only ninja tabi gives u dodge now.That 12% dodge is almost nothing.But better a little than nothing :)