If you don't know, I self-published through IngramSpark. IngramSpark isn't a publisher like Scholastic or Bandersnatch - it's a website that partners with indie authors to help them self-publish books.
Once you've proofed and purchased everything you need... it's time to publish! Technically, you've done what you need to do, but there is more you can do to make it a bigger success.
After you've finished the incredibly long and tedious editing process, it's time for the proofing process - and while you're proofing, you'll want to start purchasing...