Ok, I know I'm not a beginner, but I need help

1. Sometimes on posts and threads people say "Qi". I have no idea what that is and I was wondering if someone could tell me what it stood for.

2. I want to buy some stuff for my tori (flames, paint, hair etc.) but I don't know how. Whenever I ask on a server people always say different things.

Those are the questions. If anyone knows the answer please post it.
THANKS!