The club sponsors a volunteer exam session in Carlsbad monthly. Other sessions around the county may be found through SANDARC's VE page. Classes are held occasionally but not on any regular schedule. Watch the Event section for specific announcements.
ARRL provides several resources:
Get detailed instructions about how to register your ULS with the FCC.
FCC's Vanity Call Sign Program
If you can't wait until classes are posted, QRZ.com offers an online Ham radio exam test page for Technician, General and Amateur Extra classes. (registration required)