You NEED 10.6.8 already installed to have the app store. So that’s no help at all to the OP
I think you have to go through leopard (historically, not entirely sure why you would ‘have’ to though
Doesn’t matter at all, you can skip a generation of OS no problem. Even easier if you’re doing a clean install anyway.
What the OP needs is to either buy a single user copy of Snow Leopard which should only be about £20 or so, or borrow someone’s multi user copy for a few quid.
FWIW (probably not much) I sell Mac’s these days (new and used), if you’ve got any tech questions fire away and I’ll see if I can help…