Can you help with this case? Please, read and answer shortly:

The corporation Lucky Food Inc., headquartered in the state of California, agrees to purchase coffee from the company Cream Coffee Corp., headquartered in Puerto Rico. After 6 months of supplying coffee, Cream Coffee decides to terminate the contract, since the purchasing company (Lucky Food Inc., owes it $500.0k. Cream Coffee decides to start a legal action to claim the funds owed. However, the coffee distribution contract among the parties does not provide in court what state a dispute amid the parties would be resolved, should one arise.

Answer in the exact order please:

1) What are the differentiations among the English common law system, on which the legal system of the state of California is based, and the civil law system, on which the legal system of Puerto Rico is based?

2) What impact will choosing to litigate the case in California or Puerto Rico have on the settlement of the dispute?

Imagine that Cream Coffee decided to present his case in the state courts of the state of California and that they do not agree with the decision of the court that received the evidence presented: Please, briefly answer in the exact order.

3) Please, discuss the typical grades of hierarchy that state courts have.

4) To which court would Cream Coffee have to file its appeal to review the determination with which it disagrees?