All you have to wait on is the letter with your EAD and you're ready to head over to the local Social Security office. This is the form you'll need to fill out: http://www.ssa.gov/online/ss-5.pdf. Be sure to read all of it to ensure you bring the correct docs with you to the office. The process is fairly quick. You'll meet briefly with an officer who will review your docs and process your application.
I own a web design business and a film/tv lighting design business. My AA degree is in film production.