I am on a mission to simplify my life, and one part of that journey is learning to meal plan. I've looked on Pinterest and read threads on various message boards. It is easy to get overwhelmed with all the information out there.
If you are feeling the slighest bit overwhelmed, then I recommend your absolute first step to learning to meal plan is to simply write down what you are already eating for 2 weeks to a month.
You can print out a blank calendar and write out your breakfasts, lunches, and dinners. You can do this when you're brushing your teeth at night so you don't forget.
Then once you have completed your "food log" you have a basic idea of the foods you eat so you now have a foundation to work with.