The Creation Kit tutorials offer a host of various tips, tricks and guides on how to get the most out of Bethesda's modding software.
In today's tutorial;
Adding NPC Enemies to the game, giving them tasks to perform and patrols to follow, as well as setting their difficulty level.
Creation Kit Tutorials Playlist - http://www.youtube.com/playlist?list=PLE3E7CC13B95E5AB6&feature=view_all