I've been asked to submit a proposal for regular updating (such as posting articles/photos) for a website that has already been designed. I'm thinking of proposing a monthly retainer for a certain number of hours, plus a per hour charge for things like creating flash animations, or other creative. I'm new to this. What else should I include? I'm thinking 350/mo for 15 hours/mo plus 25/hr for extras. Any help would be appreciated. The client is a midwest nonprofit org.