PG. 169 DMG (WE ARE USING A 36 POINT BUY)
In addition to the standard method for generating ability scores
presented in the Player’s Handbook (roll 4d6, discard the lowest die,
and arrange as desired), here are eight options you might want to
consider using in your campaign.
1. Standard Point Buy: All ability scores start at 8. Take 25
points to spread out among all abilities. For ability scores of 14 or
lower, you buy additional points on a 1-for-1 basis. For ability
scores higher than 14, it costs a little more (see the table below).
This method allows for maximum customization, but you should
expect each PC to have at least one really good score.
9 / 1
10 / 2
11 / 3
12 / 4
13 / 5
14 / 6
15 / 8
16 / 10
17 / 13
18 / 16