If you are monetizing a blog you will need a media kit. It makes you look more professional to brands and puts forth the message that you treat your blog as a serious business. Brands want to work with professional bloggers they can count on not to flake out on fulfilling their side of the deal. This is a helpful media kit guide. You can also improve the design with one of these media kit templates.
Consider adding testimonials to the media kit, particularly from professional bloggers.