Just a few thoughts on garrisons for anyone starting in the new WoW expansion, Warlords of Draenor.
Your first large building should be the Barracks. This gives your followers access to patrol missions which level them up faster.
You should keep your followers running missions all the time. They will continue to work even while you are logged out. Take the missions which award garrison resources, rare items, and the purple experience missions. I didn’t think the missions that… rewarded gold were worth the cost in resources to accept the mission.
Your followers will gain experience from every mission, even if the mission fails (they just won’t get any bonus items or rewards), so keep them going all the time. Except that the gold missions are a waste, don’t worry about the cost in garrison resources, you’ll make it back later on.
Once you get a couple of followers up to level 100, change from Barracks to Dwarven Bunker. The bunker doubles your chance to gain rare or epic items as quest rewards, and increases their level. If you take this option you will end up with heroic dungeon level gear with no extra effort.
Your first medium building should be the Inn. At level one this gives you extra dungeon quests, not so thrilling, but at level two you can virtually make followers to order with the specs you require, while level three gives you valuable treasure hunter quests.
If you enjoy pvp your second medium building should be the Gladiator’s Sanctum. If not, it doesn’t really matter.
Your first small building should be the Enchanter’s Study. You will have lots of gear to disenchant, and the study lets you disenchant without being an enchanter. When you upgrade the building later, you (or a follower with enchanting), and this too applies even though you don’t have enchanting, can create enchants for neck and cloak.
Your second small building should relate to your crafting profession. This will teach you that skill up to 700, and give you a range of new recipes. If you don’t have a crafting trade, pick the building that relates to the gear you wear.
Simply questing through the zones will give you new followers, and some quests reward with garrison resources. Your garrison also generates resources on its own, so you won’t run out. You will need to save to cover the high cost of later upgrades though.
At 92 you get a couple of quests to access your mine (even if you don’t have mining). At 94 for fishing, and at 96 for your herb garden. Do these quests as soon as you reach those levels, and if you don’t need the resources they give you, sell them on the AH.