Does single member LLC as S-corp require mandatory salary?

No, there is no such law that says you have to have a mandatory salary.

Should I sign his NDA? What are the possible consequences of signing the NDA in the future?

You should not sign it without having an attorney review it. It would depend on what it says exactly. A full consultation would be necessary...

What type of agreement should we draft on an advance with a promise to pay later since I'm risking the most.

You should enter into a promissory note or something similar. An attorney can draft this up for you. A full consultation would be necessary to...

Do i have any chance of Win this case if i lawsue the company?

It does not sound like you were wrongfully terminated, but it does sound like you are entitled to compensation for overtime wages and premium pay...

You should contact the clerk of the courtroom and figure out how the court reporters work.

Do I still attend a Trial Setting Conference scheduled if I received a notice for a Default Judgement Entry?

You need to get the default and default judgment set aside. Yes, you should attend the conference.

How long do I have to serve the motion to the other side?

You have to serve the Motion no later than 16 court days before the hearing.

What do i do to get what im owed?

Your best option here would be to sue them in small claims court in FL or have an attorney write a demand letter to them.

Yes, a landlord can legally charge this as long as it is part of the lease.

What does this mean? Is our CASE vacated completely or just the motion to Dismiss?

Typically, vacate means that the court date is off calendar.