Hmm, it's still a very broad question, and I'm not sure exactly what you're going for, but I'll throw out a couple of things that may or may not be useful.

As far as overall background on medieval law, the main law traditions were the Roman system, where law was voted into being by a representative body, and case law, which AFAIK is associated especially with the English tradition, where law developed based on the decisions of past trials. Medieval law will usually be in one of these forms or a mix of the two.

There were two somewhat parallel law systems during the middle ages: secular and canon law. Clerics were usually tried in different courts and according to a different procedure than laymen.

One prominent example of social law was the sumptuary laws, present in many nations and varying considerably depending on the time and place. These laws regulated dress, decreeing certain types of fabric, color, cut, etc. to be acceptable for each social class. Many people were concerned about keeping the classes static, especially as the medieval economy grew and left lower-class merchants with the money to dress as well as nobility (feared as a source of confusion and blurring class distinction), and these laws were meant to keep the lower classes in their place, no matter what they could afford, but it seems there was usually little success enforcing such laws.

Hopefully that is of some use, and if you can think of a more specific approach you need answered, do try to let one of us know.

Ajax