Hi WillSmooth,
Welcome to the Apple Community.
How can I search for my iphone on my computer when it's not showing up on my devices list?
Use the Find My app to locate a missing device or item – Apple Support
says:
sign in to iCloud.com/find on a web browser.Â
Wondering if your iPhone had "Find My" turned on when it went missing.
It has been lost so long, the battery would likely have run out.
If your iPhone doesn't appear in the list of devices, Find My hasn't been turned on.
If Find My is offline or not working - Apple Support
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Apple support have an article online, to help with lost devices
What to do: If your iPhone, iPad, or iPod touch is lost or stolen - Apple Support
All the best :-)