Are you asking on how to add users? A quick google search will give you the Atlassian Documentation for that (https://confluence.atlassian.com/jira/add-users-325976685.html).
One thing to note is you will have to tell where JIRA will retrieve/store the user information. It can either be LDAP (AD), Crowd and/or Internal directory etc...
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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