These tutorials have been around for ages, and some of them may still work. These have caused problems before when they fall out of date with the current Ogre release. Feel free to give these tutorials a try, and post in the Ogre Help Forum if you run into difficulty. Or take some time and update them!
Xorekis' Tutorial Pack : An old collection of Tutorials for begginers.
Humble Beginnings : Your first OGRE application
Lights, Camera, Action! : Using controllers and billboardsets
Raven's CEGUI Tutorial : A CEGUI Tutorial