I homebrewed my Wii and got a NES, SNES, GBA, and DS emulator on it so I could play 2, 4-6 and 12 so if you have a Wii and you know how to do that and you're okay with using ROMs and your computer is too slow, that's definitely an option. Plus you get to use a GameCube controller. That's pretty much what I did.
A computer is fine too if it can run those things.
FE7-11 came out here and 7 and 8 (and in Europe, 11) are on the eshop. But good luck on finding the others, especially 9 and 10.
I wouldn't bother with 1 and 3, they have remakes (11 and 12), and you could try Gaiden too, but I didn't like it ver much.