Blogging is the easiest and fastest way for writers to create a platform. First, it involves writing, and writers are good at writing. You need only carve out 30 to 60 minutes a day to write a 250- to 500-word post a few times a week on the topic of your book. Then share a link to it in status updates on your social networks to begin attracting readers.
I've been suggesting that you blog your book for a long time.
Read the above article, and blog your book. It's the painless way to write.