You should not be in Brill at level 3 at all.
Stay in Deathknell, the first town when you start as an Undead. Do all the quests there. ALL OF THEM. You should be level 5 or 6 when you are done. One of the last quests you will have to do is The Red Messenger where you are sent to kill the Scarlet messenger at the Scarlet camp just southeast of Deathknell.
This quest will take you out of Deathknell and into Brill, so make sure you finish all your other Deathknell quests first. On your way out of Deathknell you will meet a Rogue who will ask you to deliver a package to the innkeeper in Brill. Take this quest. You will also meet another person who wants you to steal some pumpkins from the nearby farm. This quest is possible to do before you visit Brill and will save you some time. However, you should be level 6 before you attempt to do it.
Once in Brill, align your hearthstone to the local inn and start retrieving quests.
Special notes:
- There is a poster hanging on the wall near the Townhall. This quest is a "WANTED" quest and involves killing a Gnoll north of Brill.
- Once you have delivered the package to the innkeeper, the Rogue who gave you the quest becomes active again and has another quest for you where you must fight him for some money. It is very easy to beat him.
- On the road from Deathknell to Brill a giant abomination patrols the area. This guy has another quest for you where you must pick up some Gloom Weed from the nearby areas. If you are a herbalist you can activate your Track Herbs ability and find them easily.
If you do all the quests in Deathknell and Brill, you will eventually get sent to Silverpine Forest and The Barrens in Orc-land. You should be level 10 when that happens.
Good luck.