Though I'd like to make a suggestion, something we use(brothers and friends) for attribute generation.
We call it the "Take 82 rule," all six of your abilities will add up to 82, you can have no ability lower than 3 or higher than 18(before racial modifiers) as if you had rolled for them. For example, combinations I like are 16, 16, 14, 14, 12, 10 or 18, 16, 14, 14, 10, 10, and another would be 18, 14, 14, 14, 12, 10.