Welcome birdwatcher
Your machine is very similar to several other machines like many in the 400 series. A few links which might help are
She's real fun, my 401...
Singer 500 Rocketeer Rescue
Singer 500 question
While the first link is not for your particular machine, it is quite similar. You might want to add some 30W oil as indicated behind the hand wheel with the green arrow like Cari suggests .
Janey - Neat people never make the exciting discoveries I do.