Can I get fired for this?

Yes, you can get fired for this, as you are an at will employee and can get fired for any reason or no reason at all.

If a party is not part of my case yet, does he have to be served with my motion?

No, you do not have to serve Defendants that are not yet added to the lawsuit.

Is it legal to fire an at will employee without any warning or suspension first?

Yes, this would be legal, because the employee is at will.

Sexual harassment at work environment

You haven't asked a question, but you should report this to your human resources department and your supervisor.

Can I File a lawsuit if employer does not pay me after promotion?

Assuming that you are an at-will employee, this would not be illegal.

These are two pretty common clauses in settlement agreements. However, it depends on your personal preference whether you want to agree with these...

Assuming that you are an at will employee, yes, you can be fired for this reason.

If it is infinite, it is unlikely this would be enforced. But clauses that oblige protection for a year or two or three after termination are not...

If there is no response given to discovery, you can immediately file a Motion to Compel, no meet and confer is necessary.

What is the guidance when a customer wants you as the provider of a service to use their consulting agreement

You should have it reviewed by an attorney before executing it. A full consultation would be necessary to properly advise you.