Start off small. Just do 1 new thing a week or only plan to cook 1 or 2 meals a week using real foods. The 100 days website offers up 10 day pledges where you choose one thing to do for 10 days. This can help you develop some great new habits and you can decide which ones work best for you and your family and which ones you want to keep.
Some other helpful hints are:
Plan to try 1 new real food recipe a week (it can even be on the weekend).
Plan more meals using a crock-pot so dinner is cooked when you get home from work.
Make large meals that freeze well so you can have freezer meals available; Lasagna and Chili are great for this.
Prep recipe ingredients the night before when possible.
Choose simple recipe and meals to start.
Have other family members help with meal prep and/or cooking.