Every runner is different, and there is no right or wrong way to train. Whatever your goals you should get some advice which is specific to you: the amount of time you are willing to commit, your background (or lack of it) in running, your running style, and what you are hoping to achieve.
For new runners, you should start out with our Beginners' Guide to Running.
Several Serpentine and external coaches have written articles giving advice on many different aspects of training and racing. They are collected here.