I would like to let you know that you start with the Inn a farm , mine , fishing hole and i believe the infirmary if not then it is one of the tier 1 building you can construct and at tier 3 you have access to 12-15 plots for building in your garrison. The followers will very in rarity from poor to epic and that will determine the amount of traits the follower will have. The followers will have the ability to run Quests, Scenarios, Dungeons and Raids yes Raids at a chance for recipes for their/your profession and gear. Or you can have them just stay at the garrison and mine and or farm for you if you like. Now back to the quest and other fun stuff they will take a few minutes to a week to complete depending on what you send them to do. If you think i am trying to pull a fast on about the raiding if you bought the virtual ticket to blizzzcon 2013 the go watch the video titled World of Warcraft raids, game play, Questing, and More it is mentioned there.