Assuming you would like to know how to use workflows within Jira, below are some helpful links that may assist you. It is worth noting that Jira's workflow functionality is quite flexible, so there is not necessarily one "right" way to do things.
To start, you may find it helpful to review Atlassian's documentation on the basics of Jira workflows, which covers topics such as workflow statuses, transitions, and editing workflows:
https://confluence.atlassian.com/display/JIRA/Understanding+Workflows
If you want to get a bit more hands-on, Atlassian also has a tutorial on Building a Workflow that covers such topics as designing workflow states and transitions, working with post-functions and validators, and testing your workflow:
https://confluence.atlassian.com/display/JIRA/Building+a+Workflow
Finally, the following link contains some frequently asked questions about Jira workflows that may be of use:
https://confluence.atlassian.com/display/JIRA/Workflow+FAQ
