Roadmaster

This won’t allow me to upload the video of what it’s doing but I’m needing help. Bought this car and test drove it. Got it home, text drove again then couldn’t shift , got a grinding sound. Was able to get into what I think might be 3rd gear and got in the driveway but can’t get into garage. The gear won’t shift at all now . Can’t get into any other gear . When I put the clutch down it doesn’t roll. It won’t go forward either anymore . Please help. I’ve never driven anything this old. Def damsel in distress lol