How do we configure estimation and time tracking

We are a small publishing company and new to JIRA. We aim to use it for running a small in-house web development team, and also some company processes like IT.

We want to use agile boards to plan an execute work.
We have many and varied requirements and have found the best way for us is to put them in as stories describing the need/benefit of meeting; then attaching subtasks with detailed time estimates.
This works well until we get to reporting. When we look at Agile reports, all the lines are flat.

We are using time estimation, not story points.

What do we need to do to set ourselves correctly?

Attachments

1. Grab - screenshot of a typical story with sub tasks
2. Grab1.jpg The issues in agile view. Our sub task time estimates show up. But there is no figure at story level
3. Grab2.jpg - our burnt-out burn down chart!