1. Have you registered the image with the USCO, if not, get that done before negotiating any prices, you can do it yourself and for a small amount of money.
2. What type of company is it and how are they going to use your image?
3. It is for their exclusive use or not, unlimited or limited use or will you get royalties based on the sale of the item, royalties can be a real pain as you are relying on them to be honest about sales numbers, but some companies insist doing business they way?
4. Who at the company are you dealing with, is that person authorized to make a deal or just trying to help someone at the company? You want to deal with the person who is authorized to sign an agreement and issue a payment, less middle men less confusion and faster payment.
Any other questions just ask.
Do what you love and you will love what you do, that applies to both work and life.