Using Uno WiFi Rev2 and Adafruit NFC/RFID shield as a a NFC card reader

I'm trying to build an NFC card reader using Arduino. The goal is to have the user scan an NFC card. I want the Arduino to read the unique id of the card and send it to my laptop's localhost, which in turn will check that against a database and send back a true/false on if the person has access.

I'm completely new to Arduino. I've looked at these forums for help, but I just don't understand. Any help on the matter would be much appreciated. Thanks!