Important Stats for Archer Build

I just rolled a 96 for my Archer and was wondering apart from Strength 18/31, Dexterity 19 and Constitution 17, how should I distribute the other stats? I so far have it set to Intelligence 8, Wisdom 17, Charisma 18.
How would each of those (particularly Int and Wis) affect an Archer? Do I need Char 18 or am I better using another party member as my spokesman (if that's all Char is good for).

Thanks in advance.