Even an adaptable writer isn’t going to be good at writing everything. Some writers are more technical, while other writers excel at humor. Be sure to find a writer with the right style.
A freelancer with any kind of experience should have a solid portfolio. Examine samples thoroughly.
Unless the freelancer is just starting out, he should be able to provide names of happy clients he has worked with in the past.
Beware of the freelancer who charges too little for his work. Low rates are usually the mark of inexperienced freelancers.
Tips courtesy of Victoria Neely, Squidoo Lens Writer.