Probably the best guides on rooting are over on XDA:
[STICKY] How to Root Your Verizon Galaxy S4 MDK or ME7 - xda-developers
Your device will probably come with the latest software version, "VRUAME7", which unfortunately means that you won't be able to unlock bootloader or install custom recovery. Rooting is still possible, for doing stuff like removing system applications (bloatware), making backups, running apps that require root and stuff like that, but with no option to install custom recovery, installing ROMs is not possible.
EDIT: Also, the root process, while definitely not the most complicated I've ever dealt with, is a bit tricky with VRUAME7, as you have to make sure your SD card is formatted properly.