Using the official image is relatively quick, easy, and free to do.
https://retropie.org.uk/download/

@djshenanigans You can use the File Manager (from the RetroPie system in EmulationStation) to copy your ROMs to the SD card, from the USB stick. Just rename the retropie-mount folder on the USB, so it's not automatically mounted over the ROMs folder by RetroPie. After plugging in the USB stick, the files there should be available under /media/usb0.

@duckysarcade said in Expanding file system noob:

but when I try to “resizef2s “ I get the following errors , not in far from an expert, but I’ve tried also expanding through the raspconfig and neither seems to work , here are some photos of what I’ve done

There are no photos attached (!). Please include the information requested in https://retropie.org.uk/forum/topic/3/read-this-first to be able to better diagnose your problem.