I cooked 1 week supply worth of chicken and beef (eye of round) and cut it cubes. Portion them in ziploc bags or tupperwares 6oz for chicken and 5oz for beef (both 50g of protein) and store them in the freezer. Every night before I sleep I take the bags out from the freezer and thaw them overnight.

Upon waking, I heat up the skillet , spray some olive oil, toss in all the meat and some garlic powder or sesame or 0calorie hot sauce or whatever(pending on my mood) If i am a lazy *******, I just dump the ziploc bags in the microwave and nuke it. Pack it and leave the house.

but seriously the basic tip of eating more lean meat and eliminating high g.i carbs is perfect for starters. don't overthink unless you got your bases covered.
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I also chop my veggies and store it.