Another good cookbook to try is the
American Heart Association Quick & Easy Cookbook. Just about everything in it is easy peasy and most is very low calories, so the recipes will fit easily into a 1200 calorie diet (and the book provides nutritional info for every recipe).
It's very easy to broil chicken or fish. Just lightly season the chicken or fish with whatever you want (salt & pepper, lemon pepper, a no-salt seasoning mix like Mrs. Dash, etc.). Stick it in a pre-heated broil and check after 4-5 min. If it's not done, flip it over and check again in another 4-5 min (less if it is close to done). Fish will flake easily with a fork when it is done. Chicken won't have any pink left in the center. Then you can top the chicken or fish with salsa, chutney, or a marinara sauce.
For rice, I agree with everyone else about skipping the pre-flavored varieties. Try brown rice cooked with chicken broth instead of water (just replace all the water with chicken broth) for extra flavor. Or replace part of the water with light coconut milk for a nice creamy texture (if you are making 1 cup of rice, replace 1/2 cup water with 1/2 cup light coconut milk). Another idea is to stir salsa into the cooked rice--it's sort of like instant Spanish rice.
You also might try roasting your veggies instead of steaming them. Cut them into the individual-sized pieces, toss with a small amount of olive oil (sometimes I skip this and they usually still come out great), then stick them in the oven at around 400 degrees. Check every five minutes until they reach the tenderness you want. After they are cooked, toss with a little seasoning (some ideas to try are salt and pepper, lemon pepper, a seasoning mix like Mrs. Dash, a little fresh-squeezed lemon or orange juice, or balsamic vinegar). You could also bake your fish or chicken in the oven right alongside the veggies.