For weight loss, avoid refined sugar and white flour. Eat lots and lots of vegetables, fish, nuts, milk, and some red meat. You Want to avoid processed food. Whole grains are good to some extent, but if weight loss is your goal go easy on them. You can get your energy from fruit and nuts, which are very effective if eaten 30-90 minutes before exercise. Try to keep your meals small as well, but eat every 2-3 hours, this keeps your metabolism going. Also eat as soon as you get up, and start chugging that good ol H20.
As far as running goes, if you suck at it, whatever, you have to start somewhere, do the run/ walk method, run a minute, walk a minute for 20 minutes three times a week. Eventually building up your running time, and decreasing your walking time.
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Take it slow, I was recovering from severe shin splints, and was doing a really slow 1-mile run and got passed by an older woman(well she was probably 60+). Dont let seniors passing you get you down, just keep at it, and slowly build intensity and distance. Best of luck.