There are a few things you should be doing while waiting for us to complete your book design. These will get you ready for selling your books, but will also keep you from going mad while waiting.
If you're getting a paper book:
Sign up for Createspace.
Get bar codes for your printed books (Bowker has these available).
Sign up for Lightning Source.
Sign up for Lulu.
Locate an excellent short run printer, and get quotes from them on your book for in person sales. (This is clearly not required, but if you do conventions, set up signings, or do public speaking, ordering runs of books can be more cost effective than buying one or two at a time.)
If you're getting an ebook: