Using JIRA Agile for Scrum from a Rally user background

Question

I have been using Rally for Project Management in my previous organization, and now I have to use Jira Agile for the same job in the new organization. I am having hard time understanding the way JIRA Agile works, and could not get a hang of the tool after a week of struggle. I am sorting expert help for what I would like to achieve. I have been using JIRA for many years as a bug logging tool but not as project management software.

All I want is to create an Epics and Stories, schedule it into a particular release or sprint. On Rally this is straight forward. Few images attached here.   

I could also see the burn-down once I do the above setup, and the developers/qa start burning down or burning up the hours.

I could not achieve the same on JIRA. It asks me to create a scrum board, but I don't have a clue on how to add the child tasks to a story without creating a new child task (which I don't prefer as the tasks were already created and few started progressing).

The scrum board is also not the way it is on Rally, as it does not list the stories but directly shows the tasks which I am unable to correlate with the story. Can any one point me to a proper tutorial or assist me based on your experience in JIRA? Thank you in advance.

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