I'm not sure if there's a option for inserting external javascript files into your html document. But in the code you just add:
<script language="JavaScript" src="your-javascript-file.js" type="text/JavaScript"></script>
Make sure you copy that before your </head> and change...
Graphic Design is a very specific thing. You need to be very artistic and be able to think outside the box. But it's also a tech, so it's possible to learn graphic design incase you aren't artistically inclined. The great thing about being a graphic designer is you don't have to just be...
I would definitely go down the Wordpress route. It is a lot more user friendly. Drupal has a steeper learning curve but i'd say it's more versatile and can offer more in the ways of functionality.
But judging by what you need, i'd go with wordpress.