I've had a dozen novels published and have made far more than a dozen mistakes. Which is why Randy Susan Meyers and I wrote a guidebook to help authors avoid making our mistakes.

Don't use your advance to buy an antique sports car, diamonds by the yard, or a bottle of wine from Thomas Jefferson's cellar instead of investing in your book.

Don't spend more than 10% of your marketing/PR budget on a trailer. Trailers have to be marketed, too. So, far too many authors wind up marketing their trailers instead of their books.

M. J. Rose Quotes