Want to start playing on Lordaeron

Hello everyone, i've been doing hardcore raiding in WoTLK days and had one of the greatest experiences of my life during that period, that's why i consider trying out Loardaeron to refresh those impressions.
The few questions i want to ask before creating a character are these:
1) I would like to play Alliance, and consider rolling Hpala / Priest ( both dc or sp / mage ). I consider myself to be hardcore and skilled player, so wich one from these classes would be the most needed and useful for engame progression?
2) I'd like to experience PvP also ( arena as well as battlegrounds ) . The classes remain the same ( hpala / dc or sp / mage ). Same question , wich is most needed for Premade Bgs.
3) I can't find any class destribution graps , so , if any exist, i'd like to take a look at them.
Sorry for my english - not native speaker.
Feel free to add some more information from yourself, if you are an experienced member of an end-game raiding alliance guild, and you think there is something else i should know before deciding wich class to play.
Cheers!

Hello Acris ! You havent made a mistake by choosing Lordaeron , I am sure you will like it !
Onto your questions..
1)Mage isn't that hard compared to Hpala or Priest(dc,sp) , so the fight is between Hpala and Priest .. and I would definitely say that both sp and dc priest are harder than a Hpala .
2)Again I think mage is off the list here , but I would assume it is again priest (since not many people tend to play it , especially on pvp (sp is considered one of the hardest spec's in the game thus it means that not many players stick to the spec or even roll it ( correct me if I am wrong) . I haven't seen dc priest on pvp ...Hpalas are also a searched spec for arenas and battlegrounds , but I cant compare them that good (I don't play that much pvp) so I guess its up to you what will you choose.
3)They are in the forum just scroll down a bit and you will see they are many( every class section has its own color ( the class specific color) .
Good luck and I hope you will make some great memories within Lordaeron ! :)