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You should always follow someone who is adding value to steemit.
First of all i prefer following some best witnesses so that you can get updated what is going on steemit.
Next you have to know about you passion. If you have a passion of photography then follow good photographers blog or if your are a tech lover then follow a guy who write often on tech.
You should often visit trending/hot for hunting good bloggers. And visit new section sometime.
Now the second part of the question.
Following best authors is one of the most need to success on steemit as their blog will make you know about steemit updates and will help you creating better content.