Best thing to do is find someone who has used a lawyer and can recommend one.
The way it works is there is something called "Common Law". Basically if there is a standard practice in an industry, it effectively becomes a law. For example, its common to give 1 month severance per year worked. Thus that would be considered "Common Law". (I thought it was odd because, why not just make that a law then rather than make up a law based on common practices but what do I know. Lawyers got to make money somehow I guess)
The rule of thumb you should get between 2 weeks to 1 month severance per year you have worked. If you don't get that and you worked more than 10 years, then it would be cost affective to hire a lawyer (assuming you are a well paid professional).
Hope that helps.
Hopefully you get to keep your job and this won't be an issue.