What do you mean by People/contact? Do you mean users? If so, you assign each user a CRM license.
If you mean outlook contacts then you need to setup server-side synchronization and enable each user mailbox then install CRM for Outlook and configure it to sync Contacts. If you have never done this before, I suggest getting a Partner to help you get the
initial configuration and contact synchronization completed.
https://technet.microsoft.com/en-us/library/dn531109.aspx?f=255&MSPPError=-2147217396