Welcome to the Z from Calgary! Glad to have you on the board as a member; Tell us more about you and your truck; what kind of mods are you looking to do to the truck in the future? Performance/appearance/suspension? Lots of options, and hope we can answer any questions you might have. Also, don't forget to fill out your UserCP so can have a quick reference to your truck's details if you have any questions/comments in the future.
I'd recommend a CAI, exhaust, and a tuner. Superchips or a Diablosport Predator are the best tuners for the HEMI, I run a DSP myself and love it. Have a look through our 5.7L HEMI sub-section for more mod ideas, lots out there