You are so right about the need to have a solid marketing plan in place - before striking a key, unless you plan to give the book away to build a list of opt-in leads to grow your business.
There is no telling how many great e-books are out there - that no one has ever heard about. Do your research first - then hire yourself a Professional Web Copywriter.
Many good creative writers think to themselves: "Why do I need a Copywriter."? "After all - writing is what I do best."
Then, sure enough, they hammer out their "Sales" page, and "go live," online - in a place, which gets a fair amount of Web traffic.
It is engaging, informative, A good read, personable.
After all it was crafted by a good creative writer, (who holds a B/Arts in English Literature) or even a Masters degree.
It gets a lot of "comments" about how witty it is, as well as how well written it is.
Nevertheless, after more than 3,000 visits...it has not made a single sale. What is the moral of this story?
Having a B/A, or even a Masters in English (plus being a good creative writer) Does not make you a good Sales writer.
Good Copy writing that sells - is an acquired skill, which is "a horse of another color." Have you ever wondered why more than 97% of "Sales" Pages (launched everyday) FAIL to sell a single dime?
It is simple: being a great writer - does not automatically "make" you a sales writer. (Many CEO's have learned this the hard way.)
A professional Copywriter writes Web copy that sells - it is simply what they do. Need a professional sales writer to launch your e-book?
Hire one. It will pay you to do so.