There are lots of training plans available on the web if you search. We also have coaching webpages to help you form your own plan plus information on cross, speed and hill training which will help support improvements.
Here are some other ideas to help progression from being a total beginner to running 5km, moving up from 5km to 10km, and finally stepping up to a half marathon.
Couch to 5km – for those starting out running
5km to 10km training plan – for runners who want to double their current distance of 5km
Half marathon training – helpful guide to train for the step up from 10km to 13 miles