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Technically you have the copyright the moment you finish the work, it lasts the life of the artist plus 70 years. But the only way to have government support for that is to file a copyright. As far as the amount, you can file an unlimited amount of work under one registration. But once you file if you have any new work or update the old work you would have to file again to cover the changes.
The ownership of the published items would be based on the agreement you have with them. For a more specific answer you should check with an attorney.
To protect any of you creative works you would copyright and if needed also patent.