Listing all entries of a specific content type within a panel
If you can at all avoid it, the direction you've started in is not the solution you want. Panels is not for handling content, but context.

What you want instead is a Views content pane. Explaining Views in detail is beyond the scope of this post, but here's the general outline.


Install Views and Ctools.
Enable "Views UI" and "Views content panes".
Create a new View
Add a filter on node type so you get only the right content type.
Add title as field. Then repeat the View creation above but add the rest of the fields.
Go into Panels and add both Views in their respective regions.


Much much more info about Views in Taming the Beast: Learn Views with NodeOne.