I start mine with fresh turkey necks/wings and make stock.
Reduce the stock until it is intensely flavored.
While that is reducing pull the meat from the necks/wings and chop it.
Take dry bread cubes (I buy from a local bakery) and break them down into fine and coarse crumbs.
Add a small chopped onion, a rib of celery chopped, the chopped meat, poultry seasoning to taste(I take a small bit of the stuffing once it is mixed ad microwave it), a beaten egg per bag of bread cubes(rough guess is 8 cups of bread cubes), sage to taste (go easy, sage can be overpowering), and black pepper.
Slowly add the turkey stock and mix it in.
You want the mixture to just start to hold together when squeezed in a hand. Basically add until the bread mix has no dry crumbs left. You can add a bit of stock as it cooks if it looks to dry. Bake at 350 until the center reaches 165 degrees f.
Sorry I can't give exact measurements but I make it by look/feel/flavor and never measure