Plancing Objects

Hi, I am searching for the commands to place Objects with python. I want to make a tile game (e.g. Super Mario like).
To create the Level I’d like to use code like

Object = Load(“tree.blend”)


Have I even read any tutorials regarding Python and game engine?
I suggest to look through the stickies in the game engine resource forum.

Read about 20 tutorials yet, but could not find an answer to this problem.