Experienced runner or novice these 15 "laws" coined by Tim Noakes---who took inspiration from Arthur Newton---are useful to follow in your training.
1. Train frequently, all year round
2. Start gradually and train gently
3. Train for distance, only later for speed*
4. Don't set your daily training schedule in stone*
5. Alternate hard and easy training
6. At first, try to achieve as much as possible on a minimum of training
7. Don't race when in training or run at pace for distances above 16 Km*
8. Specialize*
9. Incorporate base training and peaking (sharpening)
10. Don't overtrain*
11. Train with a coach
12. Train the mind*
13. Rest before a big race*
14. Keep a detailed logbook
15. Understand the holism of training