Deposition and form interrogatories

Yes, you can propound discovery in this manner.

I need help recovering $4000 i lost in a work at home scam though ebay

You sue them for breach of contract.

In California, can plaintiff's attorney defend deposition of favorable non-party witness?

Yes, your attorney can do this. The witnesses can also get their own lawyer.

Who do I talk to in Long Beach, Ca for advice on negotiations with Landlord on a commercial building lease

We cannot solicit clients on here, but you can contact an attorney directly using Avvo, Google, or Yelp. I am a real estate broker in addition...

Yes. Discovery can be served 20 days after the initial complaint is served. If Defendant B does not respond, a motion to compel can be filed...

My landlord is abusing the right of entry, she has been on the property 42 of 50 days can I take her to small claims court

You should have an attorney write a cease and desist harassment letter.

What is a Summons?

It's a document that notifies the defendant in a lawsuit that they've been sued, who the plaintiff is, what court the case is in, what the case...

Can you make a complaint to HR if your boss has not fired you, but has not scheduled you or tried to contact you in 2 weeks?

Make a complaint with whom? Your boss has no obligation to communicate with you about your employment status.

Do I have legal recourse for an at-will employer after letting-go/firing after 5 weeks and insufficient training?

Since you are an at will employee, you do not have any recourse here.

Breach of k

No one can answer your question without reviewing the contract and lawsuit. A full consultation would be necessary to properly advise you.