To avoid any delays with your work, follow the helpful guidelines. It also helps having all of your information ready especially if you have a specific release date in mind.
I've used CD Baby for years and they've been consistent with the service and information they provide. It's always been user-friendly; which is one of the main reasons they're my go-to for my music and the plethora of digital outlets that comes with the service is unmatched- in my opinion.