In the chooser when I select LW8 on the left, nothing appears in the right window
Then the printer is not being seen by your Mac. The name(s) presented in the right panel will be the name(s) provided by your Printer. Even printers of completely different types (not even supported by LaserWriter 8) will be listed in the right panel, provided they can be seen.
To be seen, your printer must be connected to your Mac's Printer serial port and Appletalk must be assigned to that port and active. Appletalk could be assigned to the wrong port or could be off.
It must be connected with the correct cable, such as a Printer-8 cable. It is very easy for the cable to become dislodged at either end, and yet appear to be fully seated in the connector. There are several different cables that look identical, but are wired differently. Did this exact cable work before? The Printer-8 cable is reversible. You may want to swap which end is plugged into which device to check that it is fully seated and as a check for quirky connector problems.
Many people have better luck with a pair of PhoneNet adapters, a 4-conductor Phone cord, and a terminator in the empty jack at each end. The PhoneNet solution can be extended up to 1,500 feet or more.
The Printer must be powered on and ready to print, not still working on its self-test or complaining about out-of-paper or have other error lights on.