Taxes?

Hi! I apologize if this is a silly question, but I'm selling all of the things on my Ebay on behalf of my work (a library, so non-profit). We received all of the items for free, and I plan on giving 90% of the money back to the library, and only keeping 10% for myself (agreement with my boss, not scamming her!). How do the taxes work on that? Since Ebay requires I send the money into an account under my name, I can't just send it to them directly. I just turned 18, and am unfamiliar with all of this, so any advice would be appreciated. I'm only selling as much as can go before I leave for college, so about another 10 days. I'm currently at about $700, and wouldn't be suprised if I made more in that time.