Gwion you know what you need to do is get a
http://amigakit.leamancomputing.com/catalog/product_info.php?products_id=440&osCsid=130e6feef5c48c168858bc61aa1b4a6cand then go to
www.lemonamiga.com and download some great games from the adf links. Try games like Syndicate, Cannon Fodder, Road Rash and other top rated ones. Explore the world of old skool amiga games (they are very addictive).
Also try to get your hands on some applications. I used to use a program when I was your age called scala. Its amazing and very simple to use. I would make my own point and click advertures by drawing the pictures in dpaint and then using scala with them. Another good thing to do is look for old magazines or disk on ebay for imformation and gudience.
I know amiga seems very complex and confusing and it is
I have used it since the age of 10 and I am now 22. I still have a tiny knowlegde base :-P I still get excited when I get some software working now that I could not get working when I was a kid. Amiga is about learning how your computer really works and how changing the smallest thing can make things run.
Having an Amiga is like somebody with a really retro sports car. They know it will not go as fast as a modern car but they still drive it and clean it becuase they love the feel.
