The November 13th expansion pack for WOW features garrisons. How do they work? Here is Blizzard's four part answer.
http://us.battle.net/wow/en/blog/14001702
http://us.battle.net/wow/en/blog/15978457/garrison-preview-part-2-all-buildings-great-and-small-9-25-2014
http://us.battle.net/wow/en/blog/16218937/garrison-preview-part-3-who-are-you-calling-your-people-10-9-2014
http://us.battle.net/wow/en/blog/16788662/garrisons-part-4-take-your-place-on-the-front-lines-11-13-2014
Blizzard has a Guide to Garrisons if you don't want to bother to read all the above.
http://us.battle.net/wow/en/game/garrisons/
WOWHead has a nice summary article.
http://www.wowhead.com/news=241230/guide-to-garrisons-in-warlords-of-draenor-buildings-plots-followers-missions-and
If you are interested in getting ready for the expansion, the background downloader is already available here.
http://us.battle.net/wow/en/blog/16043924/warlords-of-draenor-patch-602-background-download-begins-9-23-2014
If you want to pick up items that are going to be removed, here is the listing.
http://www.wowhead.com/news=242815/preparing-for-6-0-guide-to-removed-mounts-pets-transmog-gear-titles-achievements
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