Making your own food is definitely healthier, more delicious and more filling than those little frozen meals. Of course they are low in calorie because they are pretty low in food. I would prefer to eat a bigger portion, have the same amount of calories and stay full longer. It's great that you want to make your own meals. Amy gave you some great tips.
I like to cook up at least 3 main dishes on the weekend so that I have food to take with me to work during the week. This past weekend I made a Bolognese sauce to eat with spaghetti squash, a chicken coconut curry and a peanut shrimp dish that I found in the "You On A Diet" book. I divide the meals into plastic containers, refrigerate, and just grab one each day of the week. None of these recipes takes that long to make and I make more than the recipe dictates so that I have extra meals. My favourite was the chicken coconut curry which I made with lots of veggies and low fat coconut milk. Let me know if you want the recipe. Also you can find any recipe on the internet. I usually search for a recipe online by adding "low calorie" or "low carb" to it and get a whole bunch of results. It's actually fun for me because I love to cook too!
Here's the recipe for the shrimp:
Grilled Peanut Shrimp with Sesame Snow Peas
1 tablespoon natural peanut butter
1 tablespoon canned light coconut milk
1 teaspoon fresh lime juice
Pinch of cayenne pepper
1 teaspoon honey
1/4 teaspoon soy sauce
1/4 cup water
1 clove garlic, peeled
10 medium uncooked shrimp, peeled and deveined
1 cup fresh snow peas
1 clove garlic, minced
1 teaspoon sesame seeds
1 teaspoon olive oil
1/2 teaspoon toasted sesame oil
Prepare grill. Place all ingredients for peanut sauce except shrimp in blender or food processor; puree. Pour mixture over shrimp; let stand 15 minutes. Thread shrimp onto skewers; discard any excess marinade not clinging to shrimp. Grill 2 to 3 minutes per side or until shrimp are opaque. Meanwhile, blanch snow peas in boiling water 2 minutes; drain and rinse with cold water. Cook garlic and sesame seeds in olive and sesame oils 2 minutes. Add drained snow peas; heat through, tossing well. Serve with shrimp.
Each serving: About 163 calories, 10 g protein, 9 g carbohydrates, 2 g fiber, 10 g total fat (3 g saturated), 53 mg cholesterol, 128 mg sodium