Weapon Selection Inventory [Please Help]

Hello BukkitForums, I need to know how to add in a weapon selection function. Basically this is what I need it to do. I would need it to let players open a inventory by typing "/revamp select" and it would open an inventory screen with 9 slots. Then from there you can click on a weapon (Rail Gun, Blaster, Rocket Launcher) once you click on a weapon it would set a variable to allow the player once in the arena to have that weapon. The one they selected. Thanks if you guys can help me out with this.

 

Shasfa Do you even know java? No offense. And here

 

No offense taken, and yeah. I'm starting to learn it. At least this forum isn't like others and they just yell "SKID!"
EDIT: Thanks for the tutorial!

 

Shasfa Lol, no problem!

 

Here is another video that explains custom menu's