Now we'll get into the actual process of getting that candidate.

On elance or odesk your going to have to create a profile in order to register your company. Then you're going to want to upload your project description to the site and wait for bids.

For Mechanical Turk, things happen pretty fast. You need to sign up, define the task and then submit it to the network where multiple people will all "complete" the task.

With Staff.com you're going to want to register, put up a job description and then seek to interview actual staff either by searching for them or with the help of a Staff.com customer service representative.