I've been wanting to play Jax recently, and am planning to play him exclusively for a while. Thing is, I'm not sure what to do when I play him! Do I start q? Do I start e? What do I max? What do I build? Here's what I've been doing: 
->
->
or
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or 
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->and some kind of tank item. Please leave feedback and advice! :^)
I would look at probuilds.net for some build advice; most of the time you're building situationally though. I think Trinity Force is more important than BotRK, but again, you want to build to your situation; same thing with leveling your skills. If you think you're going to take a lot of early auto harass, I'd probably start E. If you're against a ranged champion or something, I might start Q and try to outsustain them with pots and shove them out of lane.
as mrbuffington said, builds and what you max are situational. don't get gunblade by the way, there are better items for jax.
if you notice other team as a lot of auto attacking champs, you can get tabi, and if other team has a lot off cc, get merks.
get triforce first in easy lane, blade of the ruined king in a lane you need the lifesteal and you can even start armor/mr if you really need it and get toher items later.
flask is often really good first since jax does use mana.
your late game build is going to look kind of like triforce, blade, boots, and then defence in most cases. again, you can start defence if you are having a lot of trouble in the start.
randuins and SV are good defensive items on jax. your last item is up to you. you can go even more damage if needed, or defence of your choice.
vs range, maxing Q is often good, maxing W if not range. what you start really depends on what you are fighting.
U start with cunter strike or the hop thing to bail the fk out in the event that shit goes down lvl1 U max that one thing that lits your lamp post on fire U get the hammer, hammers are good U get the broken ass OP purple sword U get the BF shield U get some more tanky stuff
what tanky stuff and the order in which you buy anything is dependent on the match
people never take my dvie seriously despite how much sense it really makes lmao
These are items that I normally use. I'm not the best Jax player, but I do like Trinity force as a must, and the Rageblade, once you drop below 50% health, you gain more attack speed, allowing more use of your ults passive and your lifesteal. However, it is situational, and I could learn from some pro Jax players as well. Have fun with 
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leave rageblade at home. he already has a windup he doesn't need two. trade for randuins or something like witts
