Guitar/keyboard Interfacing Newbie, help/suggestions Options

Hey people,

I play guitar and piano and would like to record myself on my home computer.

I've got a Casio (CTK-631) 61-note keyboard, which has MIDI in and out and a dual G4 (450mhz) that I run under classic most of the time. What software/hardware would you suggest I use to make the two work together?

Also, if there is a way to plug in my pedals/footboards/amps/guitar into the computer to record, also. I would love to know how and I realize that I'm talking two separate issues here, digital with the keyboard and analog with the guitar... but I'm new to this stuff, so any help would be appreciated.

Thanks!