My colleague has provided and excellent answer. You should consult with an immigration attorney. Good luck.
Mr. Lorenzon's answer to your question does not establish an attorney client relationship, but rather is meant to share knowledge with the general public. For specific advise on your case, you need to consult one on one with an immigration attorney. Mr. Lorenzon can be reached at 216 573 7322 or at email@example.com. All initial constulations are free.
If you are referring to a statement attesting to the bona fides of your marriage, then no, it does not need to be notarized. It should include contact information.
713-772-2300. All information provided is general in nature. Please consult with an immigration attorney with full details of the case.
What affidavit are you talking about? Any affidavit in reference of the validity of the marriage should have the original signature, printed name, address and phone number of the person writing it and it should be notarized.
An I-751 does not require an Affidavit of Support (I-864). If you refer to affidavits attesting to the bona fides of your marriage, then they must be notarized and be very detailed to have any meaning. I suggest you consult with a lawyer to ensure you have all bases covered.
Also, if you are separated or divorced, you definitely need a lawyer.