Here's how you can start to build a readership after you publish your ebook:
Talk to everyone you know about your work.
Mention your ebook on Facebook, Twitter, and so on.
Ask people to review your book on sites such as Amazon and Goodreads.
Contact local bookstores to set up readings from your ebook; you can also take your work out to "open mic" nights and read excerpts of it there.
Libraries are always looking to hold cultural events and assist local authors; is there a spot for your work?