You own what you create, unless you formally transfer copyright over to another holder. You probably already own copyrights; copyright protections are automatic from the moment a work is created in a fixed, tangible form. There may also be works that you create for which you do not own the copyright. For example, the work may belong to your employer (if you created it on the job) or to someone else (if you transferred the rights as part of a publishing agreement).
People commonly have questions about ownership and copyright around issues such as:
For more assistance evaluating publishing opportunities, you can contact your Subject Librarian at Mississippi State University.