How to make 3D building models from lidar data in ArcGIS?

I have Lidar data, ground points and first returns. I have processed it and have ready tiles from which I am trying to build 3D building models.

So far I was able to just extrude the buildings in the ArcScene and that is it.

I am a beginner in GIS/Remote Sensing and any help would be highly appreciated.

Also, I am trying to work this out in Arc10.