BE AWARE SOME QUESTS MAY BE GLITCHED; THEY MAY FREEZE YOUR GAME.
After completing Chapter 2, “An Unexpected Party”, you are introduced to the map of Middle-earth. To access the map, press . On it you will see both white and red question marks; white is for mini-games, fetch quests and puzzles to obtain Mithril bricks, and red is marked for fetch quests to unlock the red bricks. It's suggested you complete both Story and Free Play before attempting these as many of these quests require certain character abilities to locate treasure items, schematics and Mithril bricks. Finding these items will allow you to complete more quests.
To complete the white question mark quests, you need to locate the 64 treasure items within the story levels. Most can only be collected in Free Play with a certain character. Completing each quest will reward you with a Mithril brick.
To complete the red question mark quests, you first need to locate all 32 schematics in the story levels. Most can only be collected in Free Play with specific characters. Then, you need a certain amount of Mithril bricks and different types of loot in order to forge the 32 Mithril items which then are given to the quest givers for the red bricks.
NOTE: Some characters may give you more than one quest, so after you complete one, another may appear on the map soon after. Just keep completing quests and more will show up. Some quests can only be completed during a certain time of day, go to a nearby campsite on your map to pass the time.
If you need stud money for things refer to "The Unassessably Wealthy."