Architectural Drawings

I downloaded SE because I was looking for freeware to create simple
architectural drawings, i.e., ductwork layouts, piping riser diagrams and
floor plans. These types of drawings needn't be as accurate or precise as
machining drawings, which SE seems to be for. Obviously, SE is tremendously
powerful, and consequently complex. Is this the best tool for what I need,
or can someone suggest another, simpler program that will allow me to create
these types of drawings? Perhaps there is a way to set-up SE more simply for
the tasks I need?. Thanks!