Managed to setup quark for TGE Hurray :) Need more

Hi I managed to setup quark for TGE and also made a few interiors with torque entities like lights.
Hurray :)
But I thought that major games these days have so complex levels and huge maps. Please suggest anything like tuts, readings books etc.. so that I can use quark for tge to the full. :)
I want to know more about advanced methods of level designing