How lucky you are. Think of your space like a kitchen layout. You want to have a triangle work space. Design wall first, sewing table near it Iron station left or right side next to the sewingmachine. cutting table near the fabric storage area. It does't realy matter where your stuff is placed in the room, just that they work together. You will probably rearange your stuff a couple times before you get it set the way it works best for you. Blinds on the windows a must! My big thing was having enough electrical outlets for all the gadgets, and no carpet. It is to hard to clean. One other thing is that I have no drawers in my studio. Everything is on the walls so I know where it is. Enjoy the process.
Peace :D