Hi ScotRon, thank you for try the game. I'm afraid you didn't buy anything, just downloaded the game for free, which is perfectly fine. You need to talk with Matilda, the same as the axe quest, and ask about what you need for fishing. Then, as she said, Beatrice is working only during the mornings, so you need to go to the Cavendish area during mornings, otherwise the door is closed, you cannot open yourself. The different names are because one is the manor area, and the surname of the manor of the town is Cavendish. On the other hand, Beatrice Stewards is just working in the manor area for the manor family, so nothing related about surnames :)
Good luck!