A new beginning

Since I'm at the beginning of my journey, a fellow user said don't starve myself eat lots of healthy food. If not your body reacts as if it's in survival mode and stores the fat already existing. So, I've went with the goals given by the app. I've been under that goal every day and I've eaten nothing but healthy food. I usually have Chobani yogurt for breakfast with Nourish Granola & Quinoa and 16.9 oz of water. Then just before lunch around 11:00 I'll have a banana, or Apple. Then for lunch I have a Prima Della low fat turkey sandwich on wheat with lettuce and a tbsp of mustard. Watermelon and strawberries and cantaloupe all fresh. Just a small container, a small amount of oven baked, flavored lays with another 16.9 oz of.water. I usually don't have anything else to snack on and I wait until I'm home and dinner had always been oven baked chicken with steamed veghies, or a salad with wheat spaghetti, lean low fat hamburger and sauce with mushrooms. I feel like I'm eating too much? I am full. It's amazing how I feel and still eating this much food. But, again I'm at the beginning of my journey. I always have calories left, I'm working on getting my steps in but it is tough having an office job but I'm constantly going up.and down the steps. But I'm rambling... Should I eat like this the next few weeks then re-adjust my calorie intake and fat? Because I wanted to just take it slow in the beginning then work towards a smaller goal each week. Any advice on what else I should do? Or if I am doing this correctly?