I think this Tutorials are the best way to start with 3dgs

and here is your requested code
Load a Level:
Code:
function main()
{
      level_load ("level.wmb");
      	wait(2);
      video_switch(8,32,1);//screen settings		
}


Load an object:
Code:
ENTITY* object =
{
  type = "object.mdl";
//now you can add some Flags or sth. like that
}


good luck!

Gruß Tails

An implemented second-rate idea is better than a good idea, which gathering dust in your brain.