question about nightfall

okay so i was planning to get nightfall today. i only have prophecies, but can you get the assasin and ritualist with nightfall, or do you have to have factions to get it? and another question, will the dervish and paragon be available in prophecies?

Assassin and Ritu won't be available if you don't have Factions.
You'll can go in Prophecies with a D or P but not create one in Prophecies.