All you really need to know about Caprica so far:
1. The Greystone company were the people who built the Cylons, so to have worked for them probably means having a role in Cylon creation.
2. Joseph Adama was not just a lawyer, but a mob
lawyer, in that he had ties to the Ha'la'tha, an ethnically Tauron mafia-type criminal organization.
That's pretty much it, and so far neither plot point has been important and I doubt either will.