Calorie intake questions

So I have been working on losing weight for about a week and a half now and I have some questions on calorie intake. First my calorie intake on MFP is about 2180 per day, now for about a week now I didn't realize that taking in too few calories could hinder your weight loss. Now I am currently eating six times a day, usually breakfast morning snack, lunch, afternoon snack, dinner, evening snack. My snacks are usually yogurt, fiber one bars, or fruit. Breakfast I usually eat a small bowl of cereal, lunch usually a half a sandwich, and dinner I eat normal I just choose healthier choices and eat it in moderation. Clearly eating these things are not bringing me to my calorie goal of 2180, but usually 13-1500. So I realize that I have been wrong but what are some ways or foods I should eat to help bring my calorie intake up? I have always figured it was good to eat less calories b/c MFP treats it as though it is a good thing when it posts that you were under you calorie intake goal. I definitely don't want to stop losing weight so I want to make sure I am doing this right. Also one of my friends is in pretty good shape and he eats all the time so that is why for me wanting to get in better shape I figured the less calories the better.