remember your protein, here are some good sources of protein:
Whole Eggs
Fish
Lean Beef
Cow’s Milk
Brown Rice
White Rice
Soybeans
Whole - Grain Wheat
Peanuts
Dry Beans
White Potato
also, 2000 cals a day is too low for you, im thinking you burn much more than that, calculate your BMR and find out how much you burn, start eating 250 - 500 calories more than that each day, and divide that into as many small meals as possible; 6 is common, and works well, remember, your body can make use of the food you eat if you eat less food more often (this helps digestion of the macro nutrients). start eating above your BMR, and do that for a week, if you're gaining weight, keep eating it, if you arent gaining weight, add an extra 250 - 500 cals a day and keep doing that. be sure to limit fat to 15 - 25% of your total intake and eat 1 gram or more of protein per pound of body weight.
these are some pretty basic rules and have worked for a lot of people. i dont see why they wouldnt work for you, too.