When you pick Prophecies you can only make core profession characters.
When you pick Factions you can pick core profession characters AND Ritualist and Assassins.
When you pick Nightfall you can pick core profession characters AND Dervishes and Paragons. It all depends on what look you like and what profession you want to create.
They are both correct. Just go through the character creation and you'll understand. You can choose your equipment and skills after you have created a character.
You need to get into a room with a photocopier. You see a sign pointing down a corridor, and there's only one door at the very end. The sign says 'Photocopier'. You walk down the corridor, and see that the door says 'Toilets'. Do you open the door just to see if there's a photocopier inside, or do you run back to the office without trying and claim that you can't open the door?
Sorry for the extended metaphor, but at least try going forward instead of instantly assuming something's wrong and thus it isn't worth your time and effort.