People can get overwhelmed, but most fixes ruin identifying with character>immersion>fun.
1) When my players wield their character sheets like a three-handed weapon, I've had good results with a separate "Attack Options" sheet.
I have them group by actions, include calculated bonuses. They then have something clear - with bullet point answers to the DM's question: what do you do?
2) Make it clear you want the experience to be enjoyable for everyone, then ask specifically what he wants his character to be able to "do" in game.
If his expectations are not doable, let him know. Otherwise, guiding him on the right choices for character creation becomes a lot easier - AND (if problems continue) you then better know if the "issues" are irreconcilable.