Guitar/keyboard Hookup To Dual G4 Under Jaguar, 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) running under Jaguar (though I have my HD partitioned so I can still run under classic, which is where I do most of my acoustic guitar recordings through the crappy mic). 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.

Thanks!