Well this is my first guide on MOBAFIRE and I though "What is my favorite champion who I know a lot about, lets try Jax". Jax is a very dominate player. He can be OP very early game. When mid-game comes around you should be doing work on the other team. Late game, you should be three hitting enemy champs. This build is my recommended build but you should change it to protect yourself from the other team. This guide is not guaranteeing you will like him but hopefully you will.

When buying runes I like to use Attack speed and Armor Penetration.

I buy 9 Greater Glyphs of Alacrity

I buy 9 Greater Marks of Desolation

I buy 9 Greater Seals of Alacrity

I buy 2 Greater Quintessences of Desolation

I buy 1 Greater Quintessence of Alacrity

I like to use 30/0/0

I use this because I like to maximize my damage and my attack speed, I also get some AP just to help out.

Ninja Tabis - For the Armor and the speed
Wriggles Lantern - AD, Lifesteal, Armor, Ward, and a 20% chance to do magic damage
Hextech Gunblade - Great Active, AD, AP, more Lifesteal
Trinity Force - AP, AD, Attack Speed, Crit Chance, Health, Mana, Movement speed.
Maw of Malmortius - AD, MR, Get a lot of damage when hurt.
Atma's Impaler - Armor, Health

PRO
-Able to do massive damage early
-Easy to play and learn
-Fast Jungler
-Good to chase and escape
Cons
-Not tanky
-Tageted a lot
-Need to use a certain ability cast to do more damage

When you get in game you want to start with Boots and Three health pots.
-Try to not use your health pots a lot. Save them for emergencies only.
-In lane try to harass while last hitting minions so you can maximize gold and be having maximum lane control.
-Try to save at least 500 gold before recalling, Ninja Tabi are around that much when you go to buy them.
It has been about fifteen minutes into the game, evaluate the other teams build.
-Do you need to buy more Armor/Magic Resist?
-Do I need more health or damage.
When the twenty minute marker comes look at the map and scoreboard.
-How many Turrets, CS, Kills does your team have?

You should be at around the Twenty to Thirty minute mark. You should try to also be around your Trinity Force or even farther. Keep doing what your doing it should be the same as before. Continue the build.

If your doing well you should be finishing your build. Try to be doing massive damage. Remember to be using your Hextech Gunblade so the active is not a waste.

I know this wasn't a detailed build like some of the others. If you have any questions feel free to ask. Constructive Criticism is nice to. I know this wasn't MLG material but I gave it a chance. I'll be updating through-out the next coming weeks. Thanks for looking at my build. Have a nice day! :)