All of this doesn't really mean much without seeing the files, but here are a few suggestions.
I would like to link to an external css file from with a php file that is included in another file.
You'd probably do this via a PHP echo;
Code:
echo '<link rel="stylesheet" href="/path/to/styles.css" />';
Can I include css in the include file without linking to an external css file?
Again, you'd probably do this via a PHP echo;
Code:
echo '<style>';
echo 'selector { property: value; }';
echo '</style>';
If you need more help, please provide a zip of the files you're using.
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