If you are married and have been residing with your US citizen spouse you can apply 2 years and 9 months after you obtained your green card.

You can wait for the interview but you should have documentation explaining the mistake.

How long do I have to be married to file for papers?

You can file after marriage but you would need a waiver that is very complicated due to your illegal entry. You should hire an attorney to assist you.

I am scheduled for citizenship interview in Newark in 4 weeks.I and my infant will have a 3.5 week long overseas trip in 2 weeks

As long you as you explain the situation and bring your ticket to the infopass you will be allowed to reschedule.

Out of status by overstaying. What options do I have?

Your best option is to go home as soon as possible. You need to be in status to apply for a visa.

You can go to your local post office and see if they will re-issue your passport with the new country of birth.

Fee waiver

You need to file a form I-912 for a fee waiver documenting your lack of income. You should also contact a not-for-profit to have an attorney assist...

Applying for Green Card after court marriage to a US citizen- Dos and Donts

I would recommend holding off on your marriage in your home country. You should meet with a attorney to make sure that all your paperwork is in...

I 485

I have not heard of that. You should make an infopass appointment. The red stamp may refer to the I-551 which is a temporary green card placed in...

I am an American citizen- how hard would it be to gain dual citizenship ie Canadian citizenship- I am married to a Canadian

You would need to consult an attorney who is licensed in Canadian law to answer your question.