Duration of Employment was between two states.
As far as what court to file, I would recommend the court of the county where the would be defendant lives/has their principal place of business. Any case can be filed pro se, but the reason we have lawyers is because the law is complicated. Not only the substantive law, but the procedural law as well, and an initial filing needs to have a lot of what may be seen as innocuous detail, but it is all necessary to avoid dismissal. I would seriously recommend hiring an attorney.
Best of luck!