ZSnes is pretty easy to use, it's identical to the Windows version, it even supports joysticks. There are a lot of websites that host SNes ROMs with disclaimers saying that it's OK if you used to own the game and want a backup copy, but otherwise if you download it and get caught they can't be held liable. Just google SNes ROMS or something and you're bound to find it. I use it and gens(Sega Genesis Emulator) because my old Sega Genesis exploded, so rather than try to hunt down another one, I just turned to emulators. The games are actually pretty small, like less than 5 MB apiece small.
If you haven't installed ZSnes, google it, there are downloads for it on their website.