Just get out the paper and pencil and start drafting the floor plan. I drew all the desks and tables to size, and cut them out of paper, and then just kept shifting everything around till I got the best arrangement I could come up with. Sure is a lot easier than moving furniture after it is in place. Also gives you the time to put lights where you need them. And you have 2 wonderful windows to work with. So look forward to seeing the finished room. You must be so excited.