How can I work remotely in H1B?

Your company's immigration attorney should be able to answer those questions.

Is it advisable to get married in US to H1b visa holder on B2 visa

Getting married is more of a personal issue than a legal one. The choice is completely up to you.

SPONSOR I-864

You will likely be able to sponsor a family member. Take a look at this form: https://www.uscis.gov/sites/default/files/files/form/i-864p.pdf...

You need to consult with a lawyer to go over the specific facts.

Work permit card

Call the national Customer Service number to inquire.

Did you add an extra 0 by accident, that seems egregiously excessive (40k for a Daca application is ridiculous). Make a formal request for your...

If I already send adjustment of status form and pay for it including biometrics fee, do I have to pay for I131 travel permit ?

No, if you already sent the Adjustment application and paid for it.

What is the process time of marrying within the US vs. in her country? Should we Marry within the US or in her country first?

Fiance visas are generally shorter and can have you two together sooner. It would be more expensive but you might find it to be worth it.

Can I get a green card if my U.S. citizen 5 year old daughter was assaulted at a day care and the person who did it got arrested

You may be able to qualify for a U visa. I would hire an attorney to help you with this case. U visas can lead to green cards.

When will I see an update in my case, and how much longer am I looking at after I get approved from uscis.

Generally, you shouldn't receive an update confirming that you answer the RFE. Do you have evidence that they received the birth certificate before...