If I had a time machine and could go back in time to when I first started blogging, I would have discovered the power of Pinterest Group Boards much much sooner. They're the low hanging fruit of Pinterest Marketing.
When I started joining and pinning to Pinterest Group Boards in my niche, I saw results right away. My pins started getting re-pinned and people were clicking through to my blog posts.
Group boards work like any other board on Pinterest, except there are multiple contributors pinning content to the board. They already have a built in audience - even before you've built your own.