I recommend put all your css together in the same skin, it will be minified and cached by the browser so no need for separate http requests or extra ones on some pages. It will be cached on the first page and the browser never needs to request the file again. There is no benefit to having a bunch of little css files used on different pages.
For javascript you can add page specific javascript in the html editor (CKeditor) using source view.
This forum is really for people developing custom features in Visual Studio, there are ways to add javascript from server side code in custom development, but that does not sound like what you are doing.