If the funds are sufficient towards your tuition and boarding, you should be fine.

Sponsor is in the market for 5 years, not making any profit. Can he provide TN visa?

As long as the employer has gross revenues to show there is work and is willing and able to pay, he is an eligible petitioner.

Have a copy of the proceedings reviewed by an immigration attorney to guide you further.

Can a brother/sister of U.S. citizen under F4 family-based petition visit the U.S. citizen while the petition is pending?

Yes, but the burden of non immigrant intent is to be met.

Need to learn process for INS (US Citizen married to foreign national with F1 student visa)

Start by looking up USCIS website for forms and supporting documents.

Can an employee be on Loss of Pay until he/she gets the renewed L2 EAD(1765)

You should not be "working" without having a valid EAD.

I'm marrying an O1 visa holder, becoming O3 (derivative). How long does the process to be added to his Visa take?

It is best to discuss your objective with an attorney so he/ she can guide you better.

L2 EAD working after expiration.

Working without EAD is unauthorized employment.

New I94 by visiting Canada.

The L-1B petition has to be approved for you to apply for a visa.

What forms do we need to start petitioning my wife who entered as tourist in US & do we have to pay $1000 fine for overstaying?

I would consult with a professional, at the least, to understand the process. If not, you may start on the USCIS website.