Mariana Reuter, Ang is right-on with both of her posts. Creating a social media brand is the most important way to get readers - but not if all you do is try to sell your book. You need to sell yourself first. While you take a year, two, or six ( like me - LOL) keep writing because three books on Amazon seems to be the magic number for starting to use paid advertising to reach followers. This allows for bleed-off to your other books.
Trying to attract attention by advertising a special, like offering the book at a reduced price, does nothing major for selling that one book. It may get you a review or two, but social media will gain you followers as you build your bookshelf. Start on Goodreads and do a giveaway to attract readers. Jump into groups and chat. Open an account on Facebook, Twitter, and Google and stop in daily. If you are writing a second novel, use Wattpad to gather a following by offering chapters as you write, read others on the site and review there. This will lead buyers to your already published book.
When you build a following and put up another book or two, then start using paid marketing. But as Ang just demonstrated, research first. You can do this on FB after you establish yourself. It's kind of a passive aggressive way to let others know you are published. Ask publishing questions.
Indie publishing and marketing is a big job, dedication will get you there. Just not tomorrow