The type of people you are talking about in the WoW community display the absolute worst social skills I have ever seen in a video game or in life, and I have been all over the world. It is people like those that people cancel their accounts over... the continuous barrage of immaturity and absurdity by half-wits whose best skill in life is the ability to play a video game at a mediocre level.
Anyway, their egos, or "epeens" (electronic penises) aside, here are a few links that may help:
WoW Official Site
Elitist Jerks: Priest Forum
Mr. Robot Gear Optimizer
There are many other websites that will help you out, many I am sure your friends or guildies might be willing to give. I tried tossing you a link to wow-professions.com but for some odd reason the link isn't working at the moment, nor is the other profession guide I used to use when I still played WoW.
The main thing I can think of that will help you - and you will hate this as it is anti-intuitive to an mmo - is to do as much research about your class and spec as possible over the internet. Also research fights, virtually everything you can. While one would expect that in an mmo people would be friendly and helpful with these issues, many of the players in WoW simply seem to have their heads stuck so far up their own asses they wouldn't know how to help someone if their own lives depended on it. So it sucks that you have to resort to solitary research in order to help your play experience improve, but it is pretty much mandatory, especially in your case where you do not want to get flamed for being new.
And years from now after you have done all sorts of research possible and become a hardcore raider, and the dredges of the WoW community have colored your perception with a jaded lens, just try and remember how you got started when you see someone ask for help as you yourself have done. Some people are able to maintain decency, but some people are changed by the phenomenon, and they too end up saying "stfu noob" once or twice in their WoW "careers".
Some of the angst comes from that very phenomenon. There are people who have done many years worth of research and practice, and when they come into contact with people that have not done so, they either express a false egotistical sense of superiority over the arbitrary video game information, or they have met many people who have known about the research necessary and refused to do it, preferring to simply get carried by those that have done so. In either case, many are prompted to toss out some of the generic responses you have heard and described thus far, instead of having compassion for those who may actually be looking to learn but do not know where to start.
Don't take their petty insults to heart. Just do your research, learn what you can, and practice hard. The most important thing is to learn the "WoW language" - how people talk about things and what they mean when they use certain terms. If you can learn that, it will make your future questions much more intelligible to the community on the whole, and maybe even one day you can put that dirtbag's epeen in place and get some solace.
Best of luck.