You need some sort of interface and a computer in between first.
You have to record them yourself.
Cubase 5 is no longer sold or produced due to the release of the newer Cubase 6 and Cubase 7. These newer versions of the software retail for $400 each.
Nope, It's Just For Editing Mucic Acutasicy
A few gigabytes
Yes, if keep your plug-ins to a reasonable level, it is enough.
It's an audio sequencer.
Yes, you need a cable for your keyboard, usually a MIDI.
Select the GuitarPort ASIO drivers in the VST Multitrack section of the Device Setup menu.
You can get Cubase from Steinbergs website
You plug it into the wall, plug your lead into the input and plug the other end of the lead into the input jack in your guitar.
If its wireless it wont have a plug
Install software and drivers.