Setting up a start disc in a Mac Environment

Just purchased A 2 TB to replace my 1 TB Macintosh HD on a Mac Pro (version 10.6.8).  What is the procedure for doing this.  Thanking you in advance for any suggestions.

See if the following link helps. 

Mac OS X 10.6: Changing your startup disk

http://support.apple.com/kb/PH6656