Xander,
I have seen 'demons'...twice. Actually one was what the WTS would call a demon possessed person. According to my mother a demon talked through my voice once. I had a cousin that was a Satan worshiper. The JWs thought my mother 'had demons.' I was even talked into getting rid of her ashes after I had her cremated...a move I desperately regret now.
I will say this, if there are witches among us, they won't tell you. It isn't something they talk about.
I suggest you go to the library or a bookstore (Borders, Half Price Books, etc) and look in their occult sections. You will find many books on the subjects of witchcraft, tarot, spiritism, etc. Be careful what you read, some of it is bogus. Feel free to email me if you want other info.
"...if there is a hell, I'll see you there." (NIN - Downward Spiral)
I'll be the one providing the fire.