Having seen photographic proof of the clutter on and around your desk, I’d say clearing the clutter and getting organized should be a priority. Please feel free to mail me the Tootsie Rolls and Starbursts if you need a place to “store” them. 
It might be a good idea to erase the white board calendar and reprioritize, I don’t think your family schedule from 1997 is going to help you much with editing deadlines. :eek:
Would you consider sharpening a few of the pencils the kids gave you last year for Father’s Day? 
How about fixing the chimes that have been there waiting to be mended since last December, that’ll give you a little more working space? 
Oh and how about setting the portable fan upright. I promise it will work more efficiently that way. 
I disagree with rocking chair in that I do not think you should set up a small kitchen area in your office. You don’t have much space to begin with and it’s already mighty full. I have found that for me, having snacks and sodas handy is not a good idea. They foster a sit at your desk and munch all day attitude that is habit forming and less than healthy. If I get hungry during the day, I get up and leave the office and go to the kitchen to prepare something and eat. It makes me get up from the desk and get moving, which helps battle the fatigue that comes from sitting at a desk all day and it gives me a “break” from the “office” and it keeps me from nibbling all day long. Bring a bottle of water with you, but leave the food in the kitchen.
ianzin posted great advice. I would like to add that while setting your own hours (and going to work in your jammies) is a huge perk, it’s a good idea to make a committment to yourself to be “in the office” between set hours and stick to it. The working when you “feel like it” stuff can be the ruin of you if you don’t “feel like” it regularly enough. I have found that a combination of set hours and then keeping on working when I feel like it late evenings or nights works well for me. You’re a perky early bird, so I’d imagine you’ll find the wee early hours of the morning productive, before the start of the “traditional” workday.
One other thing to beware of, my family tends to “forget” that I am working and tend to want to interrupt a call with a client to consult with me on some household business. (Something like, "Mom where are my swim goggles, not the practice ones, but the racing ones?) I wanted to be home to be available to them when I was needed, but families still need to learn to be considerate of your working space and time. You’ll have to figure out what works for you. I suggest something between constantly having kids wanting to use the copier, borrow the office stapler or kiss or vampire bite Daddy, and not disturbing unless there’s profuse amounts of bleeding involved.
Good Luck on this new pursuit, I wish you enough.
