Where are you fitness wise with respect to running? Have you ran before? What is your goal with respect to the half marathon? (Starting from a state of poor/low physical fitness to running a half marathon in 14 weeks is a huge step if you can't run 5K currently; a run/walk approach might work for the half marathon. I'm training for a half marathon in the fall and I'm targeting an under 2 hour pace.)
Diet - track what you eat and keep the calories at or below the daily allowance needed to lose weight. I log what I eat in MyFitnessPal. The app helps establish how much you can eat depending upon your life style (active,sedentary), your target weight and the date.
This forum is for everyone who is new and just getting started. Questions? Post them in this forum and get answers from our community. Need help or guidance? This is your place. Please keep in mind that this forum is for beginners. Do you remember how it was when you first started? Any contribution can go a long way. Help others and please be polite.
"If you want to lift yourself up, lift up someone else." – Booker T. Washington