To enter a turf first you must be in a registered tribe then, speak with appropriate NPC to be teleported to various turf. If you do not own the turf, you will be teleported to the attacking side or area of the turf and will have to claim the turf by defeating the defenders and the guardian monster. After defeating the guardian you will be teleported by the NPC to the defending side whenever you speak to him again. While you own the turf you can farm the monsters for rewards as long as the guardian is not slain again. Try to defend your turf from attackers.
Forbidden Islands

Iah (50-90)
Kill the guardian Corodon to claim the island then farm the Newt Rangers and Mini-Killer Mushrooms for rare gems.
Shuy (80-120)
Kill the guardian Banderscon to claim the island then farm the Bandits and Mini-Killer Mushrooms for rare gems.
Kando (120-160)
Kill the guardian Minilycan to claim the island then farm the Imps and Mini-Killer Mushrooms for rare gems.
Duan (160-200)
Kill the guardian Drake to claim the island then farm the Bomberkings and Mini-Killer Mushrooms for rare gems.
Hau (200-300)
Kill the guardian Coromon to claim the island then farm the Atacks and Mini-Killer Mushrooms for rare gems.
Tornado
(120-160)
Kill the guardians along each side of the turf then slay the Reaper that spawns to claims the turf. The right side megalopes drops Blue Tears and the left side drops Red Honors.
Frozen Land
(160-300)
Kill the Guard and King or Queen of the opposite Nation to claim the turf for a limited time and farm the monsters.
Ghost Castle
(160-300)
Kill the Walls around the castle to enter the castle itself. Kill the Creature King to claim the turf and farm Red Honors and Blue Tears from the Ghost Mays and Ghost Yubas
Ladianes Castle
(160-300)
Enter the castle in Ladianes Village through the front doors.