Before I approve this Mink, let me introduce myself. I'm from WCC, and this is Echo~
First off, we're going by human ages. So in other words, your character could be about 13 - 18. cx
Gender would be Stallion for males and Mare for females. You don't have to pick a job, but remember this: all the characters are in Ponyville. You have to have some sort of reason for them to be there.
Fix these, and I'll approve you Mink!