Reply to Live Project

Hello,
I need to set up my live !
On studio I use the new Cubase 7 and on stage I will be with a usb digital piano, a synth a pad and an acoustic drum.
I play piano and drum and on stage I would like to play the drum in some songs and piano or synth in other songs. With the piano and synth I would like to control MIDI all the sounds banks in my computer and with the drum I would like to just amplify the real sound.

I don't have the proper software and the proper sound card

Any idea ?

Thank you