You have already imported patron data from your old system, but there are plenty of options available to you regarding patrons and their accounts.
Enter your staff members as patrons
Patron System Preferences
autoMemberNum : Decide if the patrons barcodes are auto-generated or if you enter them yourself
MaxFine : Determine the maximum amount that people can owe in fines
NotifyBorrowerDeparture : Decide when to warn staff that the patron account is about to expire
intranetreadinghistory : Decide if the staff can see the patron's reading/checkout history
BorrowerMandatoryField : List fields that you want to appear as mandatory on the patron add/edit form
BorrowersTitles : Add or change the titles for your patrons
borrowerRelationship : Add or change borrower relationships (child to adult and professional to organization)
AutoEmailPrimaryAddress : Determine if the patrons get an email confirming the creation of their account
EnhancedMessagingPreferences : Decide if staff can choose from a series of notices (other than overdues) for patrons
EnhancedMessagingPreferencesOPAC: Decide if patrons can choose from a series of notices (other than ovedues) for themselves
patronimages : Decide if you want to save patron images in your system
ExtendedPatronAttributes : Decide if you want to enable custom patron fields
minPasswordLength : Enter the minimum number of characters you want passwords to have
BorrowerUnwantedField : Decide what fields your library doesn't need to see on the patron entry form
Set up your cron jobs
Decide if you would like children to automatically be come adults