If you currently are able to run 2,3 or 4 miles and would like to work towards doing a 10K race then this training plan may be a useful guide:
Timed Run – a series of opportunities to be timed over a 2 or 3 mile route. The aim is to try and improve time over the course of the autumn/winter. Uses same route each time. Suitable for all runners able to do 2 miles.