If it has a lens, somewhere for film and a space between them in the form of a box to keep the darkness in, you can use it to make pictures. Extra features are nice and can help you get to the taking stage but at the time you press the shutter, all that matters is the lens and the film.

I think the important thing is to just get something and start to use it - even if it's not exactly what you want (assuming you know what that is at this stage).