1-If the deck was to be used by her/him, then it shouldn't be paid for, since it's a tool they need it. If you ask for it as something you will use too, then $300-500 it's more than enough (if it's good)

2-Sponsors as in investors? Investors don't like people that charge a commission for fundraising (FYI). If it's sponsors as in clients or corporations, then commission.