Ron- Call AWS @ 1-800-443-9353 and request AWS QC-4-89 "Standard for Accreditation of Test Facilities for AWS Certified Welder Program" . This will give you the information- how to.
As far as if you can make enough money to cover you expenses?
That will depend on how many people you will test each year and how much you charge verses the expense of maintaining the test facility accrediation.
I suggest you obtain a list of accreditated facilities from AWS and contact them to see if they are breaking even or making money on this process.
Ken Karwowski-CWI

What are you wanting to accomplish? It is fairly costly if you just want to add it to your program, but can be recouped quickly if you are going to certify/test welders. Are you a CWI? What kind of testing do you want to do? You need to scope out the competition as well. Find out what they are doing, how, what they charge, etc...