Hi Tariq and welcome,
For your training purposes you do not need to have a specific story issuetype, story is just a name (although one commonly used) so if you can change it and use whatever you have in your project.
If you still want to add it though (all practice is good practice) first go in to Administration Panel > Issues
That should enable it with your default settings for the project, you can go ahead after that and change the rest of the settings.
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 ...
Connect with like-minded Atlassian users at free events near you!Find an event
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no Community Events near you at the moment.Host an event
You're one step closer to meeting fellow Atlassian users at your local event. Learn more about Community Events