Sites such as Match.com and EHarmony.com have garnered credibility as organizations that have been successful in making matches. There is a monthly fee for sites such is these, which according to Online Dating Zone is usually around $25. Sites such as OK Cupid and Craigslist allow you to post and search for free, but you do not have the opportunity to fill out personal information and see who is the most compatible for you.
Fill out all questionnaires and information as openly and honestly as possible. Some sites have quite extensive lists of questions, but your specific interests will help when the site recommends good potential matches for you.
Arrange an in-person meeting only when you feel 100% confident that it is a safe and good situation to be in. Meet in a public space such as a local restaurant or coffee shop where there will be lots of other patrons. Never go to a person's home or allow them to visit you at your home until you have established a solid relationship after several dates.