How to get said attention? I'm probably not the best at it, as I'm very introverted, but here's some advice based on what I've done...
First, be professional wherever you visit and use your website as your sig, like it's your virtual business card. Don't push your book but engage in helpful conversations in forums where you visit. If your book fits what someone asks for, include it with others you can recommend. Be enthusiastic about your book but be humble. No one likes a pushy salesperson--that'll turn off readers quicker than you click a button.
Also, get your books listed on as many different sites as you can. Get reviews and interviews--many sites will take self-pubbed titles and authors, but there you can't be bashful. Just remember not to push your book but to draw readers to YOU as a person through your personality and interests. Answer questions about your book, of course; THEN you're allowed to discuss it.
Keep a blog and updated it frequently. (When I don't have anything to talk about, I post little excerpts from my stories.) Keep your website updated often too, and make sure it's professional looking. (I keep the latest news blurbs about where readers can find my books or contests I've entered on the homepage with more in depth on a separate page.) Along those lines, don't get too personal. Keep it professional but don't be afraid to show yourself as a real person too.
Join organizations that support your genre wherever you can. (There are lots of informal SFF groups out there, which is my genre, so one does not necessarily have to qualify for SFWA membership to belong somewhere.)
If you can afford to, get a table at a convention to sell your books and talk to potential readers. Just be sure to have posters made and decorations. I learned the hard way, but the small publisher who put out my first book didn't get me any copies to sell...part of the reason I decided I'm better off self-publishing than accepting a smaller royalty and giving away my rights to someone else. (It's big publisher or self-publishing for me after my experiences with small presses.)
I'm sure someone else can make better suggestions, but that's what I've done. Except that I've also offered my works for free, either indefinitely or for a limited time, which was picked up by some free ebook sites. If you don't want to do that, then put together the first few chapters or a fair chunk of the book as a free PDF for people to sample. Be sure to include links where they can purchase the full book.
That's all I can tell you. It's all about getting your name out, though. I also run a fantasy e-serial with a new installment every week. It was originally going to be published by a small press, but after what I went through with the first book, I canceled the rest of the contracts. Instead, I decided to use it as a means to draw people back to my site on a regular basis by posting new parts every week for them to download and continue with the story. I only have to do some touch-up editing each week while I write other stories
