Suggestions for hardware

I plan on installing Ardour on Ubuntu 11. I’m not quite sure the computer’s specs but its decent. I only want to record one guitar/bass at a time as well as hook up an electronic drum kit (also recorded separately).

What would I need to get started as far as hardware is concerned? Audio interfaces? Soundcard?

Thanks!

@natas333x2: http://ardour.org/realfaq