It's completely up to you, but preparing meals in advance can really help. “Prepping like a boss” is a great way to set yourself up for success each day. It helps you save on time and means you're less likely to grab convenience food on-the-go. Try prepping your lunch the night before or setting aside time on the weekend to batch cook recipes for the whole week. Do what works best for you.
Most of your recipes can be prepared in bulk and stored in the fridge or freezer. Look out for ‘good for batch cooking’ and ‘good to freeze’ recipes to help.