Help 15 and 250 pounds
For losing weight, your best choice is cardio. It'll help you lose wight all over ~ you can do an hour of cardio daily, 30mins when you wake up and 30mins before you sleep.
Also my doctor said that going up and down the stairs 10x is like you've walked for an hour. So thats also good. So try doing 1hour of cardio everday, and stairs 10x daily also.
As for food. The best thing to do is, pick your favorite bowl, make sure it isnt too big or too small, then for breakfast, lunch, and dinner, eat what ever you want but make sure you measure it in that bowl only. Trust me that'll definitely help.
Try that routine for a month, see if you like it or if you feel a difference, if youdo then continue and try increasing the workouts weekly. Hope this helps, good luck, and never give up !