Know when (and how) to move to the next step.
Build on relationships
Create sales communications strategies that aren't hype-filled nonsense, but ones that really resonate, based on the relationship you've already built using content.
Send welcome messages
Send targeted messages you know will be welcomed, based on real interaction via the mailing list you've built, comments on your site, and social media.
Make it easy
Tell readers what you want them to do at strategic intervals, and make it easy for them to follow through. Don't miss an opportunity to make a sale to a perfectly willing buyer because there was no easy way for them to subscribe or purchase.