In a frying pan, add the oil and chopped celery and onions and saute. Once they are tender put them into a large bowl.
Next cook the sausage in the same pan. If it has lots of fat, make sure to drain it or remove it with a turkey baster. When fully cooked, add the sausage to the large bowl as well.
Then add the fresh herbs and bread cubes to the bowl and mix it all together. Cover it and put it in the fridge until you are ready to cook your turkey.
When you are ready to cook your turkey, fill a cheesecloth bag with the stuffing and place it inside the turkey before you cook your turkey and cook it with your turkey.
Any remaining stuffing can be cooked by itself in a crock pot on low for about 4 hours as your turkey cooks. If you do this, add about 1.5 cups of chicken stock to the crockpot while the stuffing cooks in there.