Grocery Shopping ... HELP!!!

So today is Sunday and I've decided to make today my designated grocery day. I have a loooong list of things I could get but I'm scared that most of it will go to waste. Today is also my cleaning day. So I will be cleaning out my refrigerator before I go get groceries. Like I said I have immature taste buds. I cant handle sushi, tofu, curry, beans, peas, or fish. But I'm not sure if I should plan out every single meal for the week and then buy, buy for like 3 days, or just buy everything and don't go back to the store for a while. I'm so confused! If you have any idea what I should do just let me know. I probably wont go to the store for a few hours anyways.