nanoCAD forum

My sole purpose in using a CAD program is to import purchased house plans in .dwg and modify them for my personal use. Is there a tutorial for a user who has no previous CAD experience which will show me how to import those files in a useable fashion and then to move walls, doors, windows, etc. I clicked on import and found the files on my desktop, but the result was an image which was barely recognizable and useless to me at this point.