You can download Gamemaker 8.1 from here:
Below are a list of sites with various Gamemaker tutorials
ICTMindtools – https://www.coderdojobelfast.com/ictmindtools/
An excellent site for beginning game development with Gamemaker
Most of these tutorials are used in our induction class.
Gamemaker Sprites – Some sprites to use in your games
Gamemaker Games – http://www.gamemakergames.com/
A bunch of sample games created in gamemaker