Even if you already know a little 6502 assembly, then you're pretty much on your way to knowing C. Funny you mention that processor, though, as I was asked to port my game to the Commodore 64 not three weeks ago!
I relinquished all email accounts linked to a phone number, and chose "tutamail.com" for now, but I need to wait 48 hours. Your email is listed below. Will be trying that after my account works. Take care and talk to you soon.