A silly Question by a jackeroo!!!

I have been bought the Guildwars NightFall. It's my first time to play this game.
I found that I couldn't create an Assassin.
Does it mean I can't use Assassin?

You can only create Assassins in Factions. You have to have both Factions and Nightfall in order to play as an assassin in the Nightfall Campaign. Same thing applies if you want to play through Prophecies with an assassin.

You can create Dervishes and Paragons, though. Looks like you've already opened the game. Either play as a Dervish or a Warrior (sounds like you want to go melee) or buy Factions.

actually i wouldnt advise using sins as a 1rst character especially not in pve because of the management it takes (sometimes)

go warrior if ur a noob

Assasin + Rt is factions
Derv + para is NF
(plus 6 normal)

If you're starting GW I recommend a warrior since they have good armour.