[mike31154]

Sometimes drawing it out on a piece of graph paper is a good way to start. No need for new software that you need to learn to use and may only use once or twice. Fire up the printer, there are more than likely some templates out there that will allow you to print the graph paper yourself with squares of whatever dimension is convenient, whether mm, cm or inch. Then you can apply the desired scale, say one square = 1 foot and sketch away. If you need something larger than the standard 8 1/2 by 11 sheet, simply tape a few together.