no dedicated healer/tanker like WoW

All classes can heal, and all classes have skills that can heal others as well.

You really need to check a few pages back for all the articles shared. We can't explain everything in 1 post. It will be too massive. But short answer, professions are unique. As for the heal, you can only choose 1 heal skill in your slot 6. I would suggest you start with this one http://wiki.guildwars2.com/wiki/Combat right now.   
There's US and EU worlds. You are not limited to which world to choose from the first time. You can play in EU if you like 

no such thing in gw2.
you are referring to "the holy trinity" tanker dps healer.
gw2 strives to break that mold.
in gw2, think of it like tf2, with swords and sorcery.

not necessarily.
what good is healing if you are already dead before you can heal?

however, good guardian build means no matter how good your dps is you cannot kill the guardian quickly also.
some dps builds rely on killing their targets quickly. if they fail to kill their target within those few seconds it is over for them.
i.e. glass cannon thief

and it was tested that 2 guardians can take on 5 people. cross reviving one another.
one down, one guardian rushes it, shields push people who are attempting to finish the downed guardian away.
the guardian proceeds to revive the downed guardian.
they try to finish off the downed guardian again.
downed guardian pushes enemies away.
downed guardian is revived and back on his / her feet.

Over 10k files update, looks like quite HUGE (this office Screamyx 1mbps will explode  )

I gladly spent another $60 on the first few days of launch for whatever goodies 

hehe not too bad for me, i still have D3 with friends session for pass time.

I'll settle with a dual sword, with rifle warrior.

Wow weird choice to confuse. Why so? Cause you wanna go healer? That's the closest I can compare them as.
We'll all join LYN guild. I'll team up with anyone, if not, my friends. And I can only play during night time for a few hours. I'm going to be a slow leveler. I wanna take my time for this game.

Go Ele! Ranger with bow is boring =/ but with greatsword YENG! But Melee lol. Why not try the build calculator sites, with them maybe you can have a clearer understanding thus a clearer choice.

Mine is cause of work. Same like M1X. Hopefully I still can catch up and not fall too much behind everyone.

yeah last time trial up to level 15
now free to play up to level 50

http://www.swtor.com/free

Might as well try a good MMO, if i want to start playing MMO.

yeah ke? but cinematics gooding wor. actual game play graphics cannot be that bad rite?