, until then I'll keep looking through the kid's books I have now, they're really very helpful, and already I've found several things that need to be changed
What everyone has said about 'medieval' being a big place. Once you have a feel for the general era, try to picture your own small part of it.
Besides visiting your local library for the background books ... take a swing over to the art section and see if they have any good big fat art books with medieval paintings in them.
Then do a (google image) search for "medieval". Nothing like seeing.
Fr'instance ... the second page of the (google image) search "medieval" brings me
here
You have to scroll down to the third picture to get to the dogs. (past the nice picture of women hunting, which I had never seen before.)
Anyhow -- to the dog picture.
This is your century. One picture gives us types of dogs, dog collars and mens clothing. Hats, walking stick, a couple of belt pouches -- scripts. A table.
You want a medieval cart? (google image) search "medieval" AND "cart"
Here.
Scroll down some. It's third or fifth picture down.
Have you looked into the Society for Creative Anachronism? (Just pretend I've added a whole lot of caveats,) and 'living history' sites. Google search "living history" AND "medieval".