Storage, Storage, Storage
Bookshelves of all heights to hold plastic bin's/baskets of fabric, patterns and other supplies,
and/or cubbie storage, large cutting table at a higher height (I use a large butcher block type kitchen island), sewing tables that form an 'L" to support heavy quilt while machine quilting, good lighting that is "cool" not warm, lots of outlets for everything including music or books on tape, flooring that can be easily swept free of all those pesky threads ( I prefer no carpet), rods and hardware to display finished quilts, design wall for works in process, different stations for different tasks (cutting, sewing, embrodiary, planning, layout, etc.) Good Luck, setting up a room can really be fun and often times evolves as needs arise. Don't be afraid to live/sew with your room for awhile you will discover those things that you really need and those that aren't as important to you.