How can I petition my son age 29 and married?

Once you're a citizen, you can file for your son. Contact a US immigration attorney.

Contact a US immigration attorney for specific review of your husband's and your US immigration history & documentation of deport / denial.

H1b COS approval with or without I94?

Contact the company's US immigration attorney to determine how they filed - generally, COS will receive an I94.

Can she come back and do nekah again with me we have nekah before her green card?

Contact a US immigration attorney for specific review.

Changing last name on applying for citizenship

Provide the name you wish to use - if current married name, it generally won't require a court order. Contact a US immigration attorney.

What should I do my green card application was sent from my local office to Nebraska service center ?

Schedule an INFOPASS after 90 days if you don't receive anything by then.

I am going to become a US Citizen in a month and my wife will give birth in 3 months abroad.

If you are a citizen, then the child will most likely be as well. Contact a US immigration attorney for review and filing assistance

[H1B] Change employers while previous H1B transfer petition is still pending ?

Company C's US immigration attorney will do a specific review to determine timing of employment eligibility.

H4 extension for wife

It's a strategic decision on whether you wish to have status to "fall back on" if the green card process fails. Contact a US immigration attorney...

Is it legal to work for non-US entity from US with a valid EAD?

You may work any legal job with a valid EAD. Contact an accountant regarding foreign tax issues.