General answers to these questions and many others can be found at a web site affiliated with the National Employment Lawyers Association or NELA. The site is WorkplaceFairness.org.
As described by the site, Workplace Fairness is a non-profit organization helping to preserve and promote employee rights. This website provides information about job rights and employment issues around the country and in all 50 states. It is for workers, employers, advocates, policymakers, journalists, and anyone else who wants to understand, protect, and strengthen workers' rights.
The site is an excellent place to get educated about your rights and what is involved in a wrongful discharge lawsuit.