Holly shizzal, you mean it needs words?If you go the route of self-publishing you’ll eventually, sooner than latter, have to deal with deciding if you can design a cover or if not (come on they are hard and no one can be brilliant at everything) then you’ll need to understand what you want from a designer. Knowing what you want and how to get the right look will help you not waste time and money on a book cover.
Make sure the text is easy to read, big but it still needs to sell the style of your book.
Do you want photos, drawing, just text? Think this all out beforehand but remember that the designer is there to help you so you don't need to have a fully formed concept starting out, just an outline.
What is the tone of your book? Sad, dark, strange, funny?
Knowing these things can greatly help your designer get the right feel the first round out.
TBT Works designs e-book covers for pretty reasonable prices and turnaround times.