Ok ...
You really do need to talk to your general physician before you begin an exercise program due to your condition. I, personally, do not know anything about heart murmurs. Maybe some other posters do, but none of us are doctors and cannot give you medically sound advice. Keep that in mind.
You need to start out slow. If you try to change too many things at one time, you're likely to get burnt out and give up.
Depression can often be dealt with, with a healthy diet and exercise. Avoid foods that are high in sugar and low in nutrition like regular soda, candy, cookies, etc. You might also want to avoid white bread, rice and cereals made from refined flour. Instead, eat brown rice, bran or whole wheat cereals and whole wheat bread (read labels! you're looking for bread with whole wheat, not whole wheat flour, as the first ingredient and aim for 3g. of fiber per slice). Foods high in sugar content will cause blood sugar spikes and may affect your mood.
Walking is great exercise and a wonderful place to start. By adding 45 minutes of walking, 4 days a week to your routine, you could lose almost 20lbs in a year. And thats the only change you would have to make! Imagine if you changed your diet just a little!
As far as weight training goes, in the beginning, I would recommend picking up some 3lb, 5lb and 10lb dumbbells and one of Miriam Nelson's books (Strong Women Stay Young, or another of that series). To do her workout, I think you also need ankle weights. Is this a possibility for you?
You mention that you are just out of high school. Does that mean that you are still living at home? Can you ask your parents for help? Noone should have to deal with depression alone and there is nothing wrong with asking for help.
Good luck!
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Progress, not perfection
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