I had to start the same thing too. I was fed up with having no muscle so I started a weightlifting and exercise routine in college. My current nutrition was not up to snuff and I was tired all the time. Here's a few staples I'd recommend keeping around that helped me personally. Eating a variety will help you find what helps you feel good!
Apples: A good source of fiber, filling, cheap and have a good shelf life. Perfect breakfast with peanut butter.
Protein shakes: The perfect way to add those extra 300 calories to your day to help build muscle. Easy to sip on even if you're full but know you need more calories.
Nut butters: I always have PB2 and regular peanut butter around the house.
Protein bars: I know these are demonized a lot, but there are some good brands out there with no artificial sweeteners and good ingredients. I've enjoyed Luna and Fitjoy.
Frozen chicken breasts: Cook a bunch up on a day off and pack them into lunches! Can be customized easily.
Sweet potatoes: A healthy carb with a satisfying sweetness, and perfect with a little cinnamon.
Eggs: A satiating, low carb breakfast packed with protein and relatively cheap!
Carrots, sugar snap peas, broccoli, cauliflower: All easily chopped and divided into plastic bags for grabbing on the go!
This isn't all I eat but it is what I commonly have around! Bottom line if something looks nutrient packed, less processed, and interesting to you give it a shot and see how you feel!
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