need a decent medieval house, shop , wall, and castle

all i need are the models for a house, a shop, a wall and, a castle as my friend has a made a game that we play by word of mouth kinda like dungeon and dragons but different and im planing to make a game for it so we can play together instead of using kik to go on with the story. it being textured would be nice but if you want to i can do it myself i just downloaded the software today so im a big noob at it.

Can you explain more about what you need?
What exactly will it be used for?
Level of detail?