Hey and welcome to my Jarvan IV guide, please enjoy and feel free to try it out.

This giude is not a complete yet, but i will work on it so stay put.

Other spells who i recomend when playing Jarvan:

Flash is a spell for escape, killing off an low on health enemy, or if you screw up when using your ulti.

Exhaust is used to hunt down enemies, or during a team fight to decrease the amount of dps an enemy campion can do.

Ghost is also a spell that can be good when playing jarvan, you use it for escape, or to caught up to enemies.

Cleanse makes it possible for you to get out of stuns and such.

Early game:
In the early stages of a game you will probably be able to put a lot of pressure on your enemies. pokeing your enemies with your "Q" spell and when/if they try to push simply hit each of them once and it will probably scare them off. the passive gives you a head start when you clash. also your "Q" spell is cheap and can therefor be spammed. this is also the reason that i max out this first.
when you get ulti you can probably get a kill either on your own lane or by ganking on another lane.

mid game:
mid game starts and people are starting to team up for kills. when fighting in team-fights you should start out with your "E" spell(or your ulti if it the time is right, i would recommend using it when the enemy are trying to get away or if its a losing team fight you can help your allies get away) you follow up the "E" spell with your "Q" spell knocking up as many enemies as possible.

Ending the game:
with jarvan you will be able to push fast spaming your "Q" spell and your team will hit down towers in no time thanks to the buff that your "E" spell gives. when you have completed the build you will also be able to nuke down towers realy fast and still take a blow during team fights

Hope you enjoy my build.
more might come...