What should I do next? Can I request an entry of default?

If the demurrer was taken off calendar/denied, the Defendants should have been required to answer the complaint within a certain amount of time.

How/where do I request leave to add new causes and defendants in a third amended complaint?

You have to file a Motion for Leave to File a Third Amended Complaint.

Am I required to sign a confidentiality agreement when separating from an employer?

No, there is no legal requirement that you have to sign this sort of agreement.

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How can I get out of my lease with out paying or any penalties? Is what I described enough to get me out?

Sounds like you have a variety of claims related to breach of the warranty of habitability, quiet enjoyment, nuisance, and related claims. You...

How long do I have to file an opposition to a demurrer in OC superior court?

The opposition is due 9 court days before the hearing on the Demurrer.

It sounds like you have a good claim for breach of the warranty of habitability, breach of the covenant of quiet enjoyment, nuisance, and other...

Should I file an "amended opposition to demurrer?" Is there such a thing? Do I need leave of court? Do I still file errata?

You can try to file a supplemental points and authorities memorandum, if you have time.

Are late fees on rental agreements legal?

Late fees are legal as long as they are laid out in the lease agreement.

How can I take full ownership of a 50/50 partnership (LLC) with an ineffective business partner?

The answer to your question would depend on what the operating agreement says. A full consultation would be necessary to properly advise you.

Can I be fired for trying to take over the company I work for?

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