Please bear in mind that I'm both very new to DNN and my Webforms skills are outdated (used it last with .net 1.1 .. php and asp.net mvc since)
I got this working (so far just with my css files) working things over from my html template.
In my template I have my local css files, but also link to external css like: <link rel="stylesheet" href="http://fonts.googleapis.com/css?family=PT+Sans:regular,bold">
This seems not to work (file not found) so guess either I cannot link to external stylesheets or I got to do it a different way?
I will also want to do the same with some js files.