We have some decent guides here, and of course talking to members is probably the best way to get an insight. Try starting here
http://www.musicbanter.com/rock-meta...on-thread.html
http://www.musicbanter.com/rock-meta...bum-index.html
http://www.musicbanter.com/rock-meta...your-mind.html
An invaluable source of historical information on hard rock/heavy metal, compiled by one of our most knowledgeable members
http://www.musicbanter.com/members-j...y-history.html