Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
Ok, lets start...
Dorans Shield : Is a good beginning item because of the giving healthregeneration per 5 sec and 120 health. Furthermore more think I think it is not necessary to buy the Ninja Tabi after because Dorans Shield already have some armor, anyway it's only 8. I will describe why you don't need to buy big armor items.
Berserkers Greaves : Is a good attack speed giving startitem. You will be able to win 2 on 2 laning battle after buying this item. It helps really to start the game for your adventage.
Emblem of Valour(Later Starks Fervor) : Is good because of the Passive Aura. By the way it allows you to start to jungle along the battle because of the life steal, what will bring you more gold resulting in more and better items like...
Zeal(Later Phantom Dancer) : Always bought with Trynda, it is very good for Jax too! It will continue the rampage by greater your attack speed and giving you a further advantage because of the critial it includes.
B. F. Sword(Later The Bloodthirster) : I know you think it's only attack speed and a little bit of life steal until this point, but know lets really set a new record of kills with Jax. This item will allow you to win all 1 on 1 duels bringing you a lot of gold!
Stinger(Later Nashors Tooth) : We have lifesteal, we have attack speed, crit and damage... what do we need more? Exactly : More attack speed. Well played and well fed, you will dominate against all and I mean all champions.
The further items are :
Please don't forget that the described items are here to build up to the items named above. This is really important. It will bring you total domination over the game.
Hope you like it... test it... rate... comment. If you have some ideas how to improve this build, please tell me and dont be too strict with me because that's my first build. :)