^_^ welcome to the site. if you're interested in Wicca, try reading Wicca for Life by Raymond Buckland, i found it very helpful when i was starting out. my library had a copy, check there first before trying to buy a copy.
i don't think Wiccans tend to do a lot of exorcisms, but they do cast protection spells, and do cleansings. Wicca is a rather peaceful branch of Paganism, so i don't think you'll find a lot of Wiccans who battle demons and the like. still, no harm in learning.
Wiccans believe in two things universally; Three Fold Law and The Wiccan Rede. the Three Fold Law is basically karma times three, whatever you do, good or bad, will return to you three times over. The Wiccan Rede is 'As it Harm None, Do as ye Wilt' basically don't harm another living thing and you can do whatever. this is up for debate, some feel you shouldn't eat meat because they kill the animal, others are vegans because they feel it's harmful to the animals that produce dairy, honey, so on. i know a few who refuse to drink, smoke, do drugs, or have tattoos as this would be harmful to themselves, it's all personal views really.