One of the best things to do when choosing an overall design for any product, look around to see what elements you see in other products of your nature to see what you like or dislike.  Remember this is your book, so what you want can’t be wrong.  Make a list of what you like and want, then unless you are wealthy, mark the really important elements that you’d be willing to pay extra for.  Take your list in hand to your publisher and work with them to decide what things you want that will fit into your budget.  This is all ideally done before you begin producing finished manuscript pages, but can be done at any point as you prepare your manuscript.