Is there other option besides the PERM to get a green card if I've had a h1b for almost 4 years?

The O and P visas work for artists. You can also try to prove you are an alien of extraordinary ability.

I'm travelling to Madrid, via Atlanta. and I have read that I have to fill the form I-94.

Visitor in Transit.

You can send your friend a letter inviting them to the U.S. This may help them to apply for a tourist visa.

I had a child out of wedlock, can I lose my greencard which I have had for 4 years, if my current girlfriend reports it?

Not unless the child establishes that your marriage was not entered in good faith.

When married to an immigrant if you have not yet gone to the interview are you able to get an annullment?

An annulment means that there never was a marriage. Not very likely you can get this. You should meet with a divorce lawyer if you want to end...

How can I seek legal help?

It sounds like you are eligible to file as an abused spouse, but meanwhile, have you filed for adjustment of status yet, based on your marriage?...

I am planning on applying for a US citizenship, but my mom was already a US citizen before i turned 18, but I am now over 18

If you were a permanent resident and under 18, after the Child Citizenship Act passed, you become a citizen automatically when your mother became one.

MY SON IS 30 YEAR OLD.HE IS IN AMERICA 16 YEARS.HE IS ON GREEN CARD.HE DID SOME CRIMINAL. USING DRAGS STOLEN PROPERTY....

Please see a lawyer, the inquiry does not mean anything. But doing my best, I can say that the jail can't change someone's sentence.

What happens if a Cuban friend visiting me refuses to return to Cuba

You would not have any enforceable responsibilities.

You would need a waiver from the Department of Health and Human Services, or you need to have it treated.