How to attach css to a new page template

I am creating different sections in my site and would like to have slight variations in the look for each one – mainly in the page title and then headers within the content area.

I have created a template for the first section, called “knowing”, and have uploaded it and assigned it to a page. However, I can’t figure out how to reference the new template in the css file. Is it possible to do that?

I am not great with .php although I can fake it sometimes.

Can you tell me how to create a new entry title color for the “knowing” template (do I need to create a new .header.php template for this?) and where to add the css?

The site is: http://theresarobb.com/jane/you-knowing/

Thank you very much!