A good developer will only need and image and a description of what you want it to do otherwise they aren't very good and wasting your money
our clients normally just tell us what they need and we do the rest, it's probably better to describe it rather than waste your time with making those bits within word
but if you want to make it use excel and tables which can simulate the div layout and use the vba editor to design fields etc and the developer can recreate thus in code if they can't feel free to post and I'll write your code for joomla here
Storm