Continue writing the next sentence.

How to write best selling children's books
Pick an age range.
You do not want to walk up to an agent or publisher with a vague idea of your target audience. Agents and editors don't take well to book's that are " for all ages.
" if you want to write a bestseller, it's important to have a niche age range in mind. Things like picture books and stories with only a few words are usually for ages 2 to 6.