There are many ways to find the clients online, all depending on your industry and niche. For many freelancers, online websites so called job markets are the best way to go. We recommend a few:
3. People By Hour
You can read more about each here
You can search for you clients on Linkedin by sending them introductory in-mail. Make sure it doesn’t sound to spammy.
Many designer including graphic, mobile and web successfully find their clients on Dribbble and Behance. However it is important to build an outstanding portfolio before you try to find a new gig.
You can always use Facebook, Instagram and even Twitter to find new clients.