Thanks.
In the AM Libraries . . . in Models, there is a "buildings" folder.
In it are 4-5 sample building models, if you have not seen them.
They are good examples of how to get started with "mechanical" objects, as they are sometimes referred to as.
They are pretty plain, and not many decals there but, good basic structures.
Once you can understand the decal process, it's great to be able to just slap on pictures of say; bricks, wood, tiles... etc... or your own stuff
to create anything you want... onto the structure you have built.
It takes some fore-thought (planing) and will become a real project at first but, well worth the effort once you apply yourself to it.