Congratulations upon your marriage and your plans for your husband to sponsor you in your application to adjust status to become a Lawful Permanent Resident (to get a "Green Card").
As you noted from the questions you asked, immigration processes and laws can be far more complex than they first may appear.
The mailing address for the I-130/I-485 and related forms, supporting documents and fees can be found on the instructions to the forms or at www.uscis.gov. It is a good practice to include with the application copies of documents showing that you and your husband are living together in a bona fide marriage, although you should plan to bring originals and copies of updated documents at your adjustment of status interview. It is appropriate to identify the employment of a student as: "student," and of course you may supply any further information at the interview. The fact that a U.S. citizen spouse resided abroad for two years before returning to the U.S. will not impair the application.
[Note: Consistent with Avvo policy, this communication is intended as general information and not specific legal advice, and this communication does not create an attorney-client relationship.]
David N. Soloway
Frazier, Soloway & Poorak, P.C.
1800 Century Place, Suite 100
Atlanta, Georgia 30345 www.fspklaw.com
404-320-7000 * 1-877-232-5352 * firstname.lastname@example.org