As an admin, create a new project in your system. Give it a permission scheme that hides it from the other users, and test away.
Or if you're asking about an entire JIRA system, either sign up for a Cloud account or download the Server version and use an evaluation licence
In order to be able to raise a Bug, create a issue type scheme with the Bug issue type and assign it to the new project.
Thank you for your help !
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