Research the law. Generally, to prove the elements of a libel claim, you must be able to show that someone printed a false and unprivileged statement about you, that this statement was published or conveyed to other people and that this statement resulted in damage to your reputation or caused you mental anguish.
Hire an attorney. Libel can be tricky to prove because the alleged libelous statements generally have to rise to a level that would offend a reasonable person and subject you to contempt or ridicule. Accordingly, to file a libel lawsuit in court, you would be best served by hiring an experienced libel attorney to assist you with the process.
File a complaint in state court. The first step in filing a lawsuit for libel is to lodge a complaint in court. In your complaint, you must name the defendant who made the libelous remark, explain the facts supporting your claim and describe the damages you have suffered as a result of the libel. Your attorney can advise you on how to file and serve the complaint in compliance with the court rules in your jurisdiction.
Go to court. Appear in court with your attorney on the date and time provided for your trial. You should gather all evidence that supports your claim and have any and all witnesses ready and available to testify on your behalf. The court will then listen to your case, listen to the defense and issue a ruling.