Fill pot to 3/4's full. Add shin bone, onion, garlic, tomatoe sauce and simmer till shin bone is partially cooked, close to a 1/2 hour.
Add carrots, celery and cook until they've reached the tenderness/crispness that you prefer them.
Remove the shin bone, and cut into bite size pieces, and return to the pan.
Return the bone to the pan as well. The marrow in the bone is delicious, especially if it isn't too fatty.
Some people love it, some prefer not to eat it.
Go by our own tastes. In the last five or six minutes of cooking time add the frozen peas. The pkg. will tell you the exact time they need to cook.
In the meantime, in a separate pot you've cooked the bows/noodles. Add these to the bottom of soup bowls, then add the soup.