I'm wanna start making tunes now. But my hardsisk is full to the nuts, I can clear the shite off but I don't wanna really.

Do I need a separate hard disk just for making music etc? ie does it take up a lot of space etc

What do I need to to get started? ie slave keyboard

I don't have much money so I just want the basics for the time being until I understand what I'm doing.

Can anybody help please?