Margaret53,
I've looked at those Singer Genies quite a few times. They come up on GW often. Matter of fact there is one on there now: {
http://www.shopgoodwill.com/auctions...-17305057.html }
They are typical 70s Singers that use standard low shank feet and Class 66 plastic bobbins. There's nothing really complex or exotic about them other than the shape of the body and the flowery decoration.
They'll have plastic gears inside so have them checked and if the machine has been used a lot, or not, be prepared for one of more of them to disintegrate on you.
One thing to be aware of about the presser feet and accessories, especially the walking foot, is that Singers ZZ presser foot shaft is machined different than other brands. It's thicker where the feet attach. Because of this some aftermarket feet and accessories, especially generic walking feet, won't fit properly and the needle won't line up centered like it needs to.
If you want a walking foot for your machine I suggest getting a Singer Even Feed low shank unit. They will fit and function properly.
Joe