Read my tutorial. It's 19 pages, so its probably the best explanation you'll find on this game type. Here's the different chapters and what they cover:
1. Choosing your landscape
2. Moving your character
3. Selecting characters with the mouse
4. Setting up character structure and actions
5. Working with multiple characters
6. Assigning group numbers to characters
7. The grid map explained
8. Character actions, chopping down trees, gathering resources
9. Character animation
10. Character formations, walking in patterns
11. Pathfinding, using IanM's A* library
PETA - People for the Eating of Tasty Animals