Visit visa

It depends, as she has to show non-immigrant intent & strong ties to her home country

L1 dependent Visa

If one gets an L visa, spouse and children are automatically eligible irrespective of immigrant intent.

What are the process to petition my husband for green card?he came here with a worker visa and overstayed for 2 years.

It depends. For immediate relative petitions, most overstay situations are not an issue. You should consult an attorney.

FMLA and H1B

You may have to discuss and decide from various options to deal with your situation. Recommend you consult with a qualified immigration attorney.

Would I get in trouble with uscis if I as an illegal alien file for my unfiled 2009 taxes whileI was in status back then?

The IRS does not communicate legal status of filers to the USCIS. You should also discuss your options with a qualified immigration attorney.

I'm sponsoring my spouse. I did not have W-2 form for the most recent tax year. I only have Form 1040. What should I do?

If a W-2 is not applicable, there is no W-2 to attach. If a 1099 was issued, attach that. Suggest that you consult local counsel.

Can i keep working even the OPT EAD ends if Green card EAD Bio-metrics is done !

Your question is unclear. If you have a valid green card - even if temporary, you are eligible to work on that basis.

Going to the US via H1B and H4 separately on the same day.

As long as you/she have a valid visa & approval notices (if applicable) - travelling separately should have no impact.

This is a complex situation and I suggest that you consult with a local immigration attorney, familiar with this area of the law.

DACA Renewal Application

In general, all arrests are required to be disclosed on applications that ask for this information.