Hello and welcome,
even though i am no expert myself the biggest point is the friendly community here.
i didn't even knew that the trial supports developing in C++
Of course you can develop everything in C++. But i have found that using Lua for single enemies, doors, elevators etc. are really helpful. Some special main code for your game can still be done in C++.
For collisions in C++ this Tutorial from Josh shows how simple and easy it is:
http://www.leadwerks.com/werkspace/page/tutorials/_/class-hooks-r38
I don't know where you look but most tutorials and examples here are for Leadwerks 3.