The Core Fundamentals of a Romance Series

So releasing series as a foundation I every now and then I divert and I want to do one offs or something that's not quite the same. Sometimes it works fabulously and launches a new series sometimes it doesn't work but so having the series that I build with like an arc is at the core of my books. The marketing all well no matter what I do no matter what tactics change I'm always trying to get people to try book one so there's lots  I often make book one free and so I've got the newsletter and I have never gone into building a newsletter solely on throwing stuff out there which has worked fabulous for other authors.