I have this old Imac i found in my garage, so i decided to fix it up. i got it running but the OS is extremely outdated, so can somebody tell me what OS i should get to install on this old thing? if you need specs i can try to get them but im not that much of a mac pro so itll be hard

heres some pics

That's a BlueBerry iMac G3. I would suggest running Panther (if it's the 300+MHz version with at least 128MB of RAM) or maybe Jaguar if Panther runs too slow.