Custom Press implementation issues.

I have created a custom post type, taxonomy, and custom fields that I need for my site. I am having an issue implementing/displaying the custom field on the front end. Can you provide instruction on exactly what template file has to be modified in order to populate the custom fields? I added the taxonomy embed code to my single.php
with no results.
Lastly, once I am able to get the custom field to display, where would I modify the CSS to change the look of the output.