Istan to Kourna/Vabbi help

ok i am new to GW and i just bought nightfall. ive grown tired exploring istan and want to go to the other regions but i dont know how to. can someone help me?

Sure thing! If you keep following along doing the Primary quests, they'll guide you to the mission areas. The 4 missions, in order are Chahbeck Village, Jokanur Diggings, Blacktide Den, and Consulate Docks. On the last 3, when you complete the necessary Primary quests, an NPC in the town (usually the one you see for quest reward) will have a green symbol (not the ! mark). Speak to them and they'll send you into the mission. When done, get the next primary quest and go on from there.