Den of Evil
The Den of Evil is the first quest recieved from the exiled Rogues, given to you very shortly after beginning the game from the priestess Akara. The Den is located beyond the camp palisades in the Blood Moor, the first region with hostile enemies. The weakest of these enemies are the demons called Fallen, next strongest are the Quill Rats, and Zombies. All enemies in this area are comparatively weak, and can be killed with one or two hits from your starting weapon. To reach the Den, follow the dirt path through the Blood Moor until you reach a cave opening; this is the Den of Evil. The objective of this mission is to slay all enemies within the Den. The enemies inside are identical to what you confronted in the Blood Moor, except for a couple important additions. The first is your introduction to the Fallen Shaman, a demon much like the other Fallen except that they attack with a fire bolt which does more damage, and can revive Fallen that you have killed. You can find these enemies in packs with other Fallen. The easiest way to deal with Shamans are to kill them before the other Fallen, so that they don't get the opportunity to bring every Fallen you kill back to life. The second new enemy is Gargantuan Beast (a.k.a. Wendigo), a towering brute can take more hits than other monsters and deals more melee damage. Eventually, you will encounter your first Super Unique monster, a zombie named Corpsefire who has more health and deals more damage than other zombies. It will take a few extra hits to kill Corpsefire, but the items he drops are potentially more valuable than other monsters. When the last monsters have been cleared from the Den, the red glow will disappear and light will flood the cave. When you return to the Rogue Encampment, speak to Akara and she will reward you with an extra skill point.
Sisters' Burial Grounds
Your second quest from the Rogues comes from Akara's second-in-command Kashya, and becomes available immediately after completing the Den of Evil quest. She tells you of one of the Rogues' finest captains, named Blood Raven, who despite her valor and dedication to the Rogues' cause had been corrupted by the demoness Andariel. Your task is to travel to the Sisters' Burial Grounds and kill Blood Raven to prevent her from raising an undead army.
Your first objective is to traverse the Blood Moor to the second region in Act I, called the Cold Plains. Simply follow the dirt path through the Blood Moor, killing or ignoring enemies at your leisure depending on if you gain experience. You will know you've found the end of the moor when you meet the Rogue archer Flavie. She will warn you to be careful in the next area, which you should be aware of throughout the game. The enemies in each successive area are considerably stronger, and you will find out for yourself in the Cold Plains.
Upon entering the Cold Plains, follow the dirt path a little ways until you see the waypoint off to the side. Waypoints make travel within the game much more convenient by enabling instantaneous teleportation, second only to Scrolls of Town Portal. The enemies in the Cold Plains include the Fallen and Fallen Shamans, Gargantuan Beasts, and the Corrupted Rogues. The Rogues are fast warriors that will often catch you off guard, and they travel in packs. Some will even strike at you within melee range while others shoot at you from across the screen.
To find the Burial Grounds, follow the dirt path through the Cold Plains, however there are forks in the road, one way will take you where you want to go, the other will lead you to the Stony Field, which you should remember for later.