How does ranking work in Masters/GM and Challenger?

So I just got masters and I was wondering how I get into the other two? Since everyone just has like 500 lp and things like that. Are there still promotionals?
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We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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