Regarding provision of Visa for my wife and my children, and fill form I-130?

You can write N/A in every place you find not applicable to your.

Unpaid work on h4. Can I work without drawing a salary until my h1b comes through?

One needs to be employment authorized to work in the USA. Unpaid work is till work.

Äm i obligated to pay USCIS fees to my employer

it is improper for the employer to make you pay the USCIS fees.

Can i apply for L2 EAD extension when H1 process is under progress.

Yes you can apply for EAD based on your L2.

I did not sign or put date on the extra page I added to list all addresses for form I-751. What to do now?

Wait until you get the I797 C receipt notice. Once you have the number, you write to USCIS.

I like to surender my green card what i have to do

You are free to do that at any time you find appropriate. the best way to do that is to leave the USA and hand the green card over to the...

Tax report for the money from foreign country to a F1 visa student in USA

this is not an immigration question . Best to talk to a tax attorney.

You can seek reinstatement with another school, yes. You can only study on TPS.

F1 students with tps, can i work?

I disagree with the need to choose. You can maintain both TPS and F1 but need to be cognizant of you schedule and the type of work you do to not...

N400 relocating after you file. . When's the right time to file - if you are abroad

Again, your short trip abroad will not break the 90 days instate residence requirement. You will still need to file in the state in which you live.