If you are using a food mill don't worry about getting all the seeds and skins off.
If you are not using a food mill you will want to cut the tomatoes in half horizontally and squeeze the seeds into a garbage bowl. And you could grate each side of the tomato on a box grate and throw the skins into the garbage bowl.
If you are using a food mill then just chunk up each tomato, I cut around any of the ugliness and the stems.
Add either the chunked tomatoes or the tomato pulp into a low but wide saucepan over high heat. Add the salt, olive oil, tomato paste, garlic, basil and bay leaves. Bring to a boil and then reduce the heat to a brisk simmer.
Reduce the sauce to almost half, stirring occasionally. Until the sauce is medium-thick or to your liking. Season with salt to your taste.
If you are making meatballs like I did, add them to your sauce, it will help season the sauce.