Your approach might differ, but it is probably easiest to plan all the breakfasts first, then all the lunches, and so forth.
<b>3</b>. List the recipes and ingredients needed for each day. There are apps to do this but they require you to key in all of your recipes first. <i>Meh</i>.
<b>4</b>. Do the weekly shopping for missing ingredients and staples to re-stock the provisions.
The grocery list should include vegetables; fruits; whole grains; healthy oils; and healthy proteins like nuts/seeds, beans, fish, and chicken, along with yogurt or milk.
Some especially healthy foods are: almonds, buckwheat, chia seeds, flax, hemp seeds, oatmeal, peanuts, walnuts.
<b>5</b>. Do whatever you can to prepare meals or servings ahead of time.