@Dillon-Brown
It may seem daunting, but there are plenty of people here to help.
For a start, have you looked at this?
https://docs.duet3d.com/User_manual/Machine_configuration/Networking
and
https://docs.duet3d.com/How_to_guides/Getting_connected/Getting_connected_to_your_Duet
Your config.g undoubtedly still has the SSID used by the previous owner, so that will need to be changed and you will need to configure the password.