For the green hands who have little guidance navigating unknown instance for the first time. Here we will take Wailing Caverns as example to talk about the guide for your information.
The Wailing Caverns is located in the Barrens and just west of the Crossroads and on the northern bank of the Lushwater Oasis. There players will find a large cave in the shape of a skull. Once in the cave, simply follow the first path to the left until reaching the large swirling instance entrance.
Prior to the Wailing Caverns instance, players will want to have the following quests in their log. The first quest is "Leaders of the Fang" which is gotten by following the chain starting with "The Forgotten Pools" from the Crossroads. Next is "Serpentbloom" and is obtained from Apothecary Zamah in the Pools of Vision at Thunderbluff. "Deviate Hides" is from Nalpak and can be found in the right eye socket of the skull entrance to Wailing Caverns.
Inside the Wailing Caverns, most of players are received warm welcome by the Disciple of Naralex. Each player should talk to him to receive the Druid buff Mark of the Wild. Following along the path, the party will encounter a couple of low level starting enemies, to help them get oriented and figure out the basics of each unique group situation.
Not far away from the path, the players will encounter a new enemy, Druids of the Fang when the cave opens up a drop in front of them. These Druids can heal and cast sleep spells. The first boss is located in this room, and the path circles around a gorge in the center of the room. Lady Anacondra is located in one of four locations in this room, and it is random every time. If a Rogue is available in the group, they can scout the area out and find the exact location of Anacondra. If not, simply perform a circuit around the room until Anacondra is found.
Like the Druids of Fang, Lady Anacondra is a very easy fight in the instance. Kill any enemies accompanying her first and then focus on killing her. She goes down easily. She commonly drops Serpent's Shoulders. These are leather shoulders with 59 armor and 9 agility. Now, the group can drop down into the gulley and begin heading west through the water.
Then, on the way west the group will encounter a large turtle named Kresh whom is the second boss in the Wailing Caverns instance and is a basic tank and spank battle. That is the group deals damage while the boss attacks the tank until the boss is dead. Kresh can drop Kresh's Back. This shield item has 471 armor, 9 block and increases defense rating by 6. The group can travel west and up a steep ramp to a higher level. There are many enemies to battle across this path way, but they give good experience and shouldn't generate any problems.
At last the party will encounter Lord Cobrahn at the end of the path. Cobrahn is widely considered to be the easiest of the four Fanglords. When pulled, four non-elite snakes come with him. Mages can cast Blizzard on the group and kill them shortly, while the group tanks and kills Lord Cobrahn. Lord Cobrahn drops very good loot, including Leggings of the Fang, one of the rare pieces of the set acquired in Wailing Caverns.
The group should continue working their way through the instance until at last reaching a huge cave with Lord Serpentis and Verdan the Everliving lying in wait. Serpentis is an easy and straight forward battle consisting simply of tanking and damaging him. Make sure all party members stay far away from the looming Verdan. Serpentis drops several rare items, including Boots of the Serpent, part of the Serpent set, and the Venomstrike bow, one of the best bows available for low level Hunters.