WoW has a massive online out-of-game community and there are lots and lots of very good and comprehensive sites that can give you an awful lot of information about Classes, specs, etc, etc.
I'm not sure what the policy on these Forums is for linking to other sites (that may be competitors), so I'll hold off on providing links to some of the better ones (I don't want a ban after just signing up
), but if for example, you do a Google search for "Hunter Class Guide", you should get some pretty good results near the top of the page.
Hope this helps.