Theme development

Hi all,

I'm a bit stuck.
I made a new content type called listing and I want on the bottom of every listing .... you guest it other listings.
But they have to be from the same catergory called city.... so listings from the same city...

I just don't know how :s
This is what I got

***

Title
Title: other from same category.

Format
Format: Slideshow | Settings .
Show: Content | Grid .

Fields
The selected style or row format does not utilize fields.

Filter criteria

Hi,
i'm using drupal 7.18 and i started to create my first own theme. I copied the 'Stark' theme and renamed it. In a first step i created a CSS-Stylesheet and it works fine (Caches of drupal and firefox are switched of, css-compression not active)

But when i try to change the styles of a edit form it does not work.

e.g.

div#tabs-wrapper {
  border-style:solid;
  border-width:2px;
}

or more specific

I have been creating new view modes with the entity view mode module as well as created template files for the new view modes.

At this point I would like to know how I tell a given page or url (ie. front page) which view mode of a particular content type to use

I have a content type that use viewfield module to display views on page content.

So every field added with the type "View reference" in manage field section will display the corresponding view.
I want to insert a new created custom block, between those views.
to be more clear, in manage field:

I have done a drupal theme and as of right now am only working with teaser and full view modes.  Both of which I have themed in the node--product.tpl.php file

I am interested in learning view modes to create different,  fully customizable layouts for different pages and products.

How and where to create a new view mode for a paticular node type ie. Node--product.tpl.php before themeing.  Is there a preferred module for this which doesn't limit themeing.

This is my first D7 website so perhaps I'm overlooking a configuration setting somewhere. This website is a work in progress but I developed it locally in MAMP and I wanted to see the behavior on a live server. This might be a crap shoot for isolating my problem but please throw out some suggestions. Been working on this issue for 4 hrs and can't figure it out.