I'm a softball ump.... Shorthanded, they want me to do bases for a baseball game.... will someone give me a common sense crash course in the base mechanics and anything else I might want/need to know for my first and probably only baseball game.... Thanks!

Another Site
 

If this going to be your only game on the big diamond, try this:

http://www.umpire.org

They articles on two man mechanics and will give a quick overview of basic positioning.