Would it be legal for me to follow through with this idea without being called a pyramid scheme?

Nothing prevents you from doing so, assuming you do it properly. Talk with an attorney to make sure you have correct terms and conditions, and...

Am I allowed to accept this position? Do I have to disclose this information to my current employer?

You have no authority to work for any other employer. The h1b is employer specific. Sorry.

You can report it and make a claim. But consider what the end goal is by talking to a labor attorney first.

Is my current employer obligated to retro pay me to the date my review should have been completed?

No. A raise is completely discretionary unless you had a contract which required it. And that is not likely.

Can I take a previous employer to court for delinquency in pay?

You can go to the labor commission and claim penalties for his delay in paying you. Ask a local lawyer for help or call the labor board.

Assuming you filed the release of liability before this happen you should end up ok. Check with dmv what they have on file.

How can I prepare my business from an employee mistreated lawsuit?

You are in the realm of he-said-she-said so keep all evidence available of her performance and find an employment lawyer to give you quick fact...

Are shares a sale of good?

No. Shares are not considered goods.

What cause of action can I bring to court to get back my money?

Breach, fraud, and a bunch of others. Find a local attorney to help you get some traction with this company, if it is still around to be found....

Issue with Walmart. They refuse to honor the qouted price, refuse to compensate us, and refuse to return my calls. Options?

Sounds like they are providing you with proper result under the circumstances. I don't see the issue.