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The best thing you can do is join a club which has a good juniors section. An experienced coach will be able to give you individual guidance about how to train and progress.
I started training when i was 11. I joined a local running club that trained juniors. I enjoyed it but was never much good! but can reccomend it as a good way to pick up training tips.
I used to run Tuesday and Thurday evenings and then a longer cross country run on a Sunday (3-6 miles). I think people started to do the Sunday runs once they were 11 but can't remember 100%
I also can't remember what a good time for 600m was as I never started with that distance. My first 800m (age 12) I ran 3:07 but the good runners were doing more like 2:30 or even faster.
Hey sorry i haven't been on here for long long long time. But i would like to thank everyone for the responses.
I do go to a running club now and i have been at my running club for 14 months.I really enjoy running