There are many wonderful books out there that talk about room arrangement. (I’ll list them later.) Right now I would recommend Creative Curriculum as a great start – they have some drawings of proper room arrangement.
You will need to think about having a Block Area, a Book Area, a Gathering Area, Housekeeping, Art Area, Science Area, Manipulatives, a Writing Center and some spaces that can do double-duty.
Be sure you have room for everything, and if you have to make some areas to double-duty, that’s ok. Be creative!
One exercise that we did several years ago was to imagine what your Dream Classroom would be like. Draw it! You may not be able to do everything, but maybe you can begin on one thing now. It’ll get your creative juices flowing!