Good call Don. Becky if you really want to learn how to do it then download Inkscape and follow the the tutorials on here and once it's been created as a JPEG etc then print it out on A4 printer and enlarge to A3 on a photocopier or printer. It can be split on two A4 sheets which is another way.
Or someone on here will create it for you as Don has just asked for info. Roly