What is it? Do you just have a spirit lingering by you that you visit in dreams? And how do you have vampire spirits? I guess you have the vampires that have already died off. Can somsone just explain every aspect of it. Any dangers, etc.

Mmm you might need to read this article first:
http://www.creepyhollows.com/spiritkeeping.html

And then check the encyclopedia, for example these sections:
http://www.creepyhollows.com/faq/index. ... how&cat=16
http://www.creepyhollows.com/faq/index. ... how&cat=15

As well, sections in the forum:
http://www.creepyhollows.com/phpBB3/forum1.html

; )