What will I happen to me now since I worked on a tourist visa ?

Your unauthorized employment will be forgiven if you are the beneficiary of an immediate relative's petition, such as your US citizen spouse. ...

Will I be ok if USCIS recieved my I 751 form on the date my green card expired?

You should be OK. First, you are within limits and, secondly, USCIS is likely to forgive one day or even a couple of days, at least this was once...

Does the National Visa Center always notify the petitioner and/or beneficiary when visa is about to become available?

They don't notify you when the priority category becomes current - that you can follow yourself by reviewing the visa bulletin. After all the...

Will I have any issues with immigration if I've been in the US a few years without doing taxes?

Taxes won't be an issue. As far as proof of the bona fides of your marriage, the more the better. I strongly suggest you hire a lawyer to represent...

Is true that he has to wait 4 years to get married with me ?

She just doesn't want you. There are no restrictions other than the affidavit of support requirements.

What reason should we provide for parents Tourist visa and what should be the duration ?

Visiting son and his pregnant wife is a good enough reason. Also the consular officer may examine their ties to their country - job, assets, other...

Will I be able to return in the US with my I-751 and expired green card?

I concur with my colleagues: you will be able to return with the documents you have.

If my fiance is a refugee in Italy, will he need an Italian travel document in addition to the K-1 Visa?

In addition to what you mentioned he will need all of his divorce decrees if any. He will certainly need a passport or a travel document to travel...

Send to the asylum office the pages of I-589 with correct answers and a letter explaining the corrections. Bring a copy of the letter and the pages...

I am sure your agent can provide a letter detailing your work in US., your itinerary, and your compensation. Your income tax declaration will also...