If you believe you have been defamed sufficiently to consider legal action to address the issue, the first appropriate step in the legal process is the issue of what is called a "concerns notice".
A "concerns notice" has a special place in defamation law as it will provide limits on the opportunity for a publisher to make amends before the costs of their conduct really start to be a major consideration.
You need to consider the following: What has been published? Who do you believe has published it? What imputations do you think are wrongly made?
if you know those things, then Diaspora Legal can charge a fixed fee for a half hour conference with you in person or by Skype and the settling and serving of a concerns notice from Diaspora Legal.
The first step is a conference with a Diaspora Legal solicitor to obtain advice, and have a concerns notice drafted, settled and served.