좀 더 자세히 알려드렸어야 하는데…
참고하시기 바랍니다.

http://uscis.gov/

How Do I Get a Work Permit (Employment Authorization Document)?
http://uscis.gov/graphics/howdoi/ead.htm

Step 1. Filing I-765
I-765, Application for Employment Authorization
http://uscis.gov/graphics/formsfee/forms/i-765.htm

E-Filing
http://uscis.gov/graphics/formsfee/forms/efiling.htm

Filing Fee $175

Step 2. Make an appointment for USCIS Application Support Center
Photographs and Fingerprints for Form I-765,
Application for Employment Authorization
http://uscis.gov/graphics/formsfee/forms/e-photo.htm#I-765

Scheduling An Appointment for Fingerprinting and Photographs.
http://uscis.gov/graphics/formsfee/forms/e-photo_schedule.htm

Waiting time to speak with representative takes quite long time, so I recommend make it early in the morning as soon as you filed I-765.
(Please make a phone call at any time and find out when is their business hours first.)

Step 3. Visit USCIS Application Support Center with documents required
http://uscis.gov/graphics/fieldoffices/aboutus.htm#serviceCenter
http://uscis.gov/graphics/fieldoffices/ascs/asc.htm#california

I went to SAN JOSE ASC.

Renewal EAD: You should apply for a renewal EAD six months before your original EAD expires.

Q. Do I have to pay for filing fee every time I renew my work permit?
A. Yes.

FAQ
http://uscis.gov/graphics/faqsgen.htm#auth

Hope this helps,

예약 하는데, 전화로 기다리는 시간이 보통 20~30분 걸리므로, 업무 시작하자 마자 걸어서 예약 잡는 것이 좋습니다.
Filing만 하면 바로 예약할 수 있으므로 기다리실 필요 없습니다.
Filing 후 Confirm되면 다음과 같은 내용을 확인하실 수 있습니다.
You must phone the BCIS National Customer Service Center at 1-800-375-5283 [TTY 1-800-767-1883] to schedule an appointment with your local Application Support Center.
You will need your BCIS Receipt Number and ASC Fingerprint Code to schedule the appointment.
• The Application Support Center will collect a digital photograph, signature, and fingerprint from you at your appointment.
• Please bring a copy of your e-filed application and this confirmation receipt with you to your appointment at the Application Support Center.
• YOUR APPLICATION CANNOT BE PROCESSED UNTIL YOU HAVE APPEARED FOR YOUR APPOINTMENT AT THE APPLICATION SUPPORT CENTER.

참, 제 경우에는 집사람 것을 신청하는 것이였는데, marriage certificate를 추가 요구하더군요.
호적등본을 번역해서 아래 내용을 덧붙여서 notary 10불 내고 보냈습니다.
Certification of Translation
I, [Translator Name], certify under penalty of perjury of the laws of the United States, that I am competent to translate from the Korean language to the English language, and that the above is a true and correct translation into English of the Korean marriage certificate of [Name] and [Spouse’s name] attached hereto.

아니면 http://www.form114.com/ 에서 유료 서비스 받으실 수 있습니다.
그런데 호적등본이나 그런 서류는 있으시겠지요?
없으시면 미리 준비하시는 것이 좋을 것 같습니다.