Always get the boots first. You can mix between Mercury's Treads and Ninja Tabi. Always make a Hextech Gunblade, because it gives a nice bonus in the beginning, AD, AP and Lifesteal. To be sure that you will not die in the future, make a guardian angel, with a good amount of Armor and Magic Resist. Then, take the Rod of Ages, it will give HP, AP and Mana, and at the end of this build, you have much armor, magic resist. And with the passive Jax, your HP will be more than 3 000

you can order anything you like, I personally prefer this.

The flash can be used to escape or attack. The ignite spell can help you a-lot in the beginning, and you get 10AP after use.