Can I begin school with TPS while my visa switching process is going on through USCIS?

F1 consular processing will be the most likely route - contact the school's DSO and/or US immigration attorney for assistance.

N400 applications as a couple and different progress. Is this normal?

Yes - background checks are not processed the same.

Is there a waver for the DACA or some sort of help I can obtain ?

There is no fee waiver for DACA that I am aware of. Contact a US immigration attorney for assistance.

WWhen is the best time to apply for my green card after having r-1for 1 year 10 month?

Contact your organization's US immigration attorney about strategy assistance.

You can't. The green card holder needs the card or stamping. Contact a US immigration attorney.

I need to travel out of the country while my H4 extension is about to be filed.

Contact the company's US immigration attorney.

Probably it's USICE documentation that must be completed before a person is removed. Contact a US immigration attorney about local USICE procedures.

What is the process when marrying an American citizen while you're on DACA, if you've entered legally?

With a legal entry and overstay you can file for adjustment. Contact a US immigration attorney.

How long does the process take in Houston to obtain a green card for my wife if I'm in a U.S. Citizen?

General processing time nation-wide is 9 to 12 months.

Yes, but the Embassy can deny for discretion. Contact a US immigration attorney to review options.