Well, for the most details, have you downloaded the iPad2 User's Guide? If not, available at this link Apple - Support - Manuals - go to page 114, the chapter on 'contacts.'
Basically, you can add contacts from the iPad w/ a wireless connection or sync w/ your computer, depending on your needs. For myself, I imported our Yahoo contacts into the iPad by using the 'Settings' choice and then the 'Mail, Contacts, & Calendar' options - just requires a few entries - good luck and please post back if a problem arises -