You need to give us a good explanation of your product and provide some context on what you're doing and what the results should be.
You can send us a full specification list of all features and content you want us to work on. Some clients send us wireframes and styling inspiration, but it's not a problem if you don't, we can always figure this out ourselves.
Once we know the ins and outs of your product, we can get started with the first task.