Im a 17 year old girl Im 5 foot 4 and weigh around 9 and a half stone I decided the other day I want to run to lose weight on my thighs around my knees and stomach Can anyone give me any tips?

*note*

these are deffinately my problem areas, for the past couple of weeks i have noticed my thighs have got bigger in my leggings and my belly chubbier than normal, i blame unemployment for this as i am not using as much energy than running around in a store working. like i said any tips? i am new to the whole running thing as well :D i used to belong to a gym but i had to stop going due to finances.