Which masteries?

Just started playing LoL (level 10 at the mo) and wondering where I might be able to find a guide for which masteries to choose and runes also. Should I wait 'til level 20 to get runes but choose masteries now?

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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