Is it possible for me to migrate with him when his wife file a petition for him?

He cannot apply for you before he receives his green card. Once he is a green card holder he may petition for you.

Can I go to Canada for four days and enter US again with my F1 visa?

If you have not applied for travel document, you may do so.

What can I do? Can I apply to a green card and AOS?

Nothing prevents you from marrying a US citizen while on F1 status. My advice is that you hire an attorney to do the work for you. An attorney can...

Is the owner allowed to ask us for money or free labor in exchange of letting us access to her terrace ?

If the agreement mention any payment, he may be ask for something. The payment must be reasonable though. $250 per day does not seem reasonable.

If you are applying for your spouse's green card, I highly recommend that you hire an attorney. Green card based on marriage may seem easy, but it...

Work authorization is different from your status. Since you have EAD, you are authorize to work. That is all that matter for I-9 form.

I-400 application. Processing is current yet no news and effect of change of state. I have a just some few little questions reg

If you are not a US citizen and are over 14 years old, you must notify USCIS any change of address within 10 days. This is mandatory.

Where can I find an experienced immigration lawyer that has previously won Writ of Mandate for asylum cases?

Avvo does not allow attorneys to directly solicit business. You may contact the attorneys you desire through their profile or you may check AILA.com

Since my I-140 (EB-2 Category) was approved once, isn't that enough proof that I have more than 5 years experience?

Prior I-140 petition is not helpful in determining your work experience. You may want to consult with an attorney who can speak with the prior...

You may want to consult with an immigration attorney before doing the application.