Every family is different and has different needs and wants and allergies etc.
So, first , pray sincerely to know what YOUR family needs to do and in what order. It helps to have a spouse that also feels a need to become prepared, but it is not essential. Heavenly Father is big on doing things in an orderly fashion. You need to know what you have in order to know what you still need. Start gathering preparedness recipes, water purification sheets, etc.