want to share you my experience about finding a target market. I've been using this technique 5 month .
My fist advice is Twitter! Just research for your keywords on Twitter and join those groups. After then just follow people whose joined that groups(follow just 10 people/day!)...send them "thanks" private message!! And if your followers around 100 send them your first offer!
And then you can make a lens on Squidoo about your offer and join relevant groups! Leave a comment on relevant squidoo pages/search for them on "recently updated" page/. Be active on those groups(comments, advices)! Make an own group.
Bookmarks are very effective ways to build relatinonships! Very important: Don't Spam!Dugg news as much as you can about your topic and leave good comments. First send them interesting news, videos... DONT add 100 friend one day! Just 5-10!
That's irritate when you add to your friends a lot of people on first day... and if you have 50 MUTUAL digg friends send them your first offer. I've 100 Digg friends after 1 month! So I can send them my best offers this way(once a month).
I hope you find it useful.