I agree with everyone...look at the posts here in the gallery. Take notes and give yourself time. It always seems like I am changing how I organize my stuff.
One thing I 'love' are my cabinets...super easy and not too expensive from the big box hardware store. There might be a pic of them in my gallery.
Maybe start creating in there with a few items and see what you 'feel' you need.
Most of all...have fun! So great to have your own room...I share mine with the boys and computer/xbox...but I do love them being in there with me too.