Skip the i-control thing. Use a mouse, at lleast at first them later these are other contol surfaces you can use if you don't like the mouse. Some of 1/2 this price, some 20X more, some with piaon keys built in. Lots to choose from but at first a mounse will do the job.
What will you plug the mic, bass and guitar into? Will you plug them all in and record them at the same time?
You will need a USB audio interface, which one tobuy depends on how many tracks you record at once and your budgt.
I recently had the same question, about how to hook up a guitar to Garageband / Logic....Someone recommended the Line-6 UX1 or UX2 which works with Guitar, Bass and Vocals. I plan on getting a UX1 myself