This is where you begin to flesh out your concept. In a skinny, skeletal, emo kind of way.
Attributes
There are four attributes in I'm Not OK, which come in two pairs. Brains and Brawn, and then Style and Substance. You have 10 points to allocate to each pairing. So if you decide you want a genius character, you might give her Brains 8, which means you have 2 points lefts over for Brawn. There may be people out there who are both very strong and very clever, but they'd make me feel inadequate, so I've made their existence in my game mechanically impossible.
But be careful! Emo kids are puny, so they start off with -2 brawn. This means you need to spend 3 points just to raise an emo kid up to kittenish levels of strength.
Skills
You have 10 points to allocate to your skills. The first level you take in a skill costs one point, the second costs 2 points, the third costs 3 points, and so on.
For more information on attributes and skills check out the pages on the School Hard setting.