I currently do not have any expansions for WoW but I was wondering what would happen to my current characters if I were to install "Wrath of the Lich King"? Would they be deleted or just still be there?

...because I do not have a weapon anymore lol, I have it in my hand, but I can't fight with it anymore. anyone know what is going on? or how I can get it to work again?

Were do I find Greater Sagefish I am a mage and it is a very useful recipe for me?

I started out leveling up with tailoring but I want to switch to mining now instead. Can I unlearn tailoring and switch or am I stuck with it?

What profession is the best for making a lot of gold?