The whole Immediate Skills list stuff confuses the crap out of me too, so don't worry about it, your not the only one!, doesn't help that the website is useless and you just seem to go round and round in circles only to arrive back where you started, or on a "Page not found" error.
Here's a link to the Long Terms Skill Shortage list :
Appendix 6 - Long Term Skill Shortage List
It also shows you what kind of qualification you should have.
A Future Growth area consists of :
* Biotechnology
* Information Communications Technology
* Creative industries (Advertising, Software & Computing Services, Publishing, TV and Radio, Film and Video, Architecture, Design, Designer Fashion, Music and Performing Arts, Visual Arts).
Hope that helps a bit