What kind of licenses, permits, certificates, if any do I need to do this. Do i need declare myself as a business? Tax cert.?

You should probably start an LLC just to protect yourself. It has the tax benefits of a partnership with the protection of a corporation.

I don't think anyone uses partnership anymore and I never recommend it for my clients. LLC or a corporation is the way to go. Research both and/or...

You should discuss your case with your PI attorney.

Potential issue with car insurance claim

Sue the individual, they will be backed by their insurance company.

Businesses like PayPal take 3% fee for using their service. Is this profit sharing?

No, this is a service fee that they charge.

Can I do something about how she is singling me out and publicly talking down to me and constantly threatening me?

This is not a business question. You would have better results if you post it under employment.

There are many factors that play a role. Do you have an employment agreement between you and your employer?

Can I possibly file a medical malpractice lawsuit against a private hospital for 2 misdiagnosis of my mothers illness?

You can complain to the hospital. You should contact a local personal injury attorney that focuses on medical malpractice.

Can I terminate his employment and replace him as an employee despite his ownership of 50% of the shares ?

You would have to look at the Shareholders Agreement. If you have terms that define this, you should follow that. If there are no terms as to...

What actions can be taken on an autodealer who has been giving false promises?

This can come down to a contract dispute. The only issue is that it might not be worth hiring an attorney to litigate this because the damages...