@joshtop Restore a factory image for Nexus 5 from here https://developers.google.com/android/images
or here
https://forum.xda-developers.com/google-nexus-5
Best to pick one between android 5 and 7, any will do.
Also, plenty of help on how to in the forums. Just search "nexus 5". If you bought one because you don't know how to do any of that, there is the Nexus 5 tool, that does most of it for you in the Nexus 5 vs Nexus 5X thread. Only works on windows though.