Tutorial Request - Creating 'Strategy/ Building/ Simulation/ Tycoon' type game

Hi Ambershee, I appreciate the response. I appreciate that stuff is all really simple for you, however I am having some difficulties getting my head around it. Its fine, placing objects in 3d space, importing my assets, building lighting, building levels. I am just not sure how to approach this from a top down view, where you restrict what can be placed with predetermined assets in predetermined axis.

If you could link to some of this stuff it would be greatly appreciated.