The following link is a good source for helping to learn some of the square dance calls. 

The site has basic/mainstream/plus...and higher level calls.  GOOD DANCING!

http://www.opensquares.de/basic.html

http://saddlebrookesquares.com/lessons.htm

SEMCA
The Southeastern Massachusetts

Coordinating Association Inc.

Square and Round Dance Foundation of Rhode Island

NESRDC - New England Square and Round Dance Convention