Hi meg29, your husband is the sponsor and you are his dependant. I'm sure you know that if you have children or if your parents are dependant on you then you will have to include their information. As far as I know, you have to say N/A for things that are not applicable. If you don't, they might think you forgot to fill that portion and will ask to resend the from with that portion filled out. You have to write N/A as required on the form and send it back to them. My suggestion would be to call the call centre and find out what exactly they want from you.
One other thing, I was trying to find the form on the CIC website but couldn't locate it. Please let me know which form it is so I can give a better suggestion. Hope this helps.