Can anyone give me a few WoW lvl 80 tips im new?

Ok heres whats good im a lvl 80 arms warrior and realized i got 22k health i look around everyone got 100k health...Im new to the game this is my only toon i quit for a while cus my computer completely shut down and never really got filled in with all details of the game cus other player in game when you ask questions its hell cus they gotta be a dick about it well anyways i know warriors stats are stamina and str are there any secondary stats i should worry about...And heres a few more questions since im 80 ima need to do heriocs and stuff like i dont know to much about valor points and all that ughh i look like a complete noob can anyone give me some tips? Please and thanks :)