If you are skipping breakfast, you've set yourself up for failure for the next 8 hours!
These are wise words, pay close attention as this tip alone will make a big difference.
You'll want to make a new habit of eating EVERY morning.
You'll need to make it easy so start off with something that's simple for you to prepare.
A couple of peanut butter and jelly sandwiches in the morning with a glass of apple juice and a glass of milk is an easy way to go.
Your biggest problem is getting calories so this is what you should focus on, that doesn't mean you should eat junk food as nutrient dense foods should always be your first choice, BUT if you have nothing good to eat then some junk food is better than nothing. You'll want to make sure that you're eating nutricous food as your staples though.
So fruits, vegetables, lean meat, fish, bread, pasta , rice, milk, cheese. Try and eat 3-5 meals a day. If you're only eating two now, try eating three as this is a realistic increase. Add a glass of milk or juice with every meal to increase calories as well as healthy snacks in between.
As you increase your caloric intake your appetite should increase as well.
A good book I could recommend is Optimum Sports Nutrition by Dr. Michael Colgan.
Good luck.