What is that?
>> Drag and drop
Remember, AutoCAD was originally developed in the '80s, drag & drop was a MAC thingy, not DOS. It's called insert here.
>> Doors / Windows
1st thing to do is to determine whether you are going to work in 2D or ACAD's psudo 3D ( extruded 2D + 3DFACEs ) or the newer 3D solids.
In 2D, hatch patterns can create brick affects, in 3D you model each brick and mortar joint. Rendering can apply materials that resemble brick, block, etc to 3DFACEs.
Always draw 1=1 in model space. Scaling is done in paper space.