Skill quests in Nightfall?

I created a dervish and got a few skills. Im lvl 20 and didnt get any more skills other than like the 3 that I bought. Can anyone tell me other than the first few skills you get, do you get any other quests that reward you skills or do you have to buy everything else you want. In Prophicies there were many quests to obtain skills but I just didnt see them pop up in NF. Thanks in advance.

You have to buy the skills from the skill trainers.

In order to get skills you have to buy them. You're going to need a lot of money and skill points to buy all of them. The best way to get said items is to farm. Unfortunately, ANet makes it necessary for us to farm and then does everything in its power to take farming away from us, or at least make it as tedious as possible.

Hero Skills NPC o.o Gain Hero Skill points as you get Sunspear/Lightbringer title. You have a choice as to which skill you want so...=/

Gone are the Ascalonian freebie skills.

the sunspear training area, [Expert Dervish] will teach you skills