oh you did great! she's beautiful!
look and see if the screw fits where you attach the feet. it looks kinda like that one.
there is a sticky at the top of the page on how to clean up a vintage machine. someone suggested in another thread using an automotive scratch remover, which i bought, and while it worked great on my car it didn't seem to make a lot of difference on the sewing machine finish. i didn't work it very hard, though, because i didn't want to damage anything. i think this one is good enough you could just clean it and enjoy it like it is.
you could also try waxing it. I bought an automotive wax that was safe for clear-coat finish and used it. the particular one i got was named Meguire's, but i think any would probably be ok. that would protect your decals, too, as far as i know, although i am new to this obsession.
have fun!
oh - i should add don't use that scratch remover or anything harsh on the decals. you might try out anything you want to use in an inconspicuous part of the back, just to make sure.