Irrlicht Engine

hi,

i want learn opengl to better understand a 3d engine.
my first problem is the create a scene manager ..

i want add my objects to a scene manager und he sort and display this correctly.

have anybody a tutorial or link for a simple scene manager in opengl?

thx

yeah cool engine, but have anybody a sample for rotation camera? i want create a md2 model viewer for my custom md2 models .. but not check to make with irrlicht. i want load in the center the md2 model and rotate and zoom the camera (not model). *the maya camera not good work* or coming a tutorial ...