Advice – Maps in my Ebook

I read a lot of fantasy. A LOT. If you clicked on this entry, you probably read a lot of fantasy too. Most of the fantasy books I’ve read include at least one map. Now, I’m writing a fantasy novel. Should I include a map of the world I’ve built? I’ve sketched out the map and plan to send it to a professional. Have any other authors had trouble formatting their map within the book?