How do I set up a user on the second hard drive

Hi all,

I recently bought a 2x500gb mac mini.

When you get the machine, one HD has OSXLion Installed and the other HD is empty.

What I want to do is set up a user (i.e. desktop, documents, downloads etc etc) on the empty HD and password protect it.

In other words I want my family to have all thier user profiles on one HD and have my work user profile on the other HD.

Is this possible without installing a whole new OSX Lion on the other drive?

Thanks in advance!

Ray