Social media is a key element of many authors' marketing plans, but you're making a mistake if you focus on book sales — especially right out of the gate. Start early, take it seriously, be social, and you may find success promoting on social media.
Expand your approach to book sales to include retailers other than bookstores (including online retailers). The more strategic you are about where your book is available, the more likely your target buyers will be to find and buy it.
When embarking on his Kickstarter campaign, author Chuck Miller spent a lot of time looking at other campaigns for ideas. He checked all the boxes, from producing videos to getting creative with donor rewards, on his way to achieving his goal.