How should I train for half marathon? What will advice her to do?

Hello. Im a 16 year old girl who just started running this summer as a way to get fit. Im training right now to run my first half marathon May 2018. The longest distance Ive ran so far is 14 km,
 
and today I ran 10 km in 58 minutes. How should I train so that I can a) Cover the distance of half a marathon without having to stop b) Get a time under 2 hours (I can barely get under 1 hr doing 10k)???
Thank you