Hi,
I have seven or eight business spaces running on my server. The server load seems to be more a function of how many processes are running at one time than how many business spaces those processes are running on.
Creating a new business space is a simple process that is well documented in the manual, just right click on the header and select 'New' or File/New or Ctl-N.
If you want to test for changes in server performance you can load all of the supplied samples in separate business spaces and run them all at the same time but I doubt that you will notice any difference.
Cheers,
Pete