Start with what you actually use
Do not try to do everything in one weekend. Start with the recipes you need this month: the base sauces, the stocks, the parts of your current menu. The rest follows whenever you look for it.
Take good photos
Photograph in daylight, straight from above, one page per photo. A stain or a crooked corner is fine, a shadow across the text is not. Lay the paper flat on a dark surface.
Have it read, do not retype
Retyping easily takes ten minutes per recipe and adds new typos. With an app that reads handwriting, such as Savour, you turn the photo into a recipe with ingredients and method. Important: always check the quantities. A good app invents nothing and shows where it is unsure.
Give every recipe the same shape
Title, yield, ingredients with quantity and unit, and the method in steps. When all recipes share the same structure, everyone in the brigade can read them, without knowing your handwriting.
Keep the original
Do not throw the notebook away. Add the photo to the recipe if you like. The original sometimes tells more than the recipe itself: a note in the margin, a date, a name.
Savour reads Word, PDF and photos of handwritten recipes and turns them into one recipe book.