Have you checked the wiki? Some information is there, but not a lot. I think having a place for new people and non-raiders to get this information would be helpful. I'd love to see a compendium covering the basics from adepts to treasure maps, to isolated stuff like Gnok/Plaguefang/Lavascale, to raid zones like Dragonhorn Keep and Prison. In fact, I'll start it here, and see what happens, because I'm not a raider here. Yet. So here goes, accuracy not promised.
Treasure Maps - these can be fished at higher skill levels or looted. These range from aptly named Simple and Very Easy to Very Difficult and Extreme that can challenge even top guilds. Treasure maps generally require a shovel and at least 1 group. Right-clicking a TMap will tell you what zone to go to. When you get there, you will be directed to an area where you are to dig (right-click effect of shovel). Digging will eventually result in spawning a wave of mobs to kill, and a chance to get a treasure chest. Killing faster and digging faster tends to result in faster chest spawning. The treasure chest will generally have tier-appropriate loots and some cash loot. A right-click Generate Raid? Yes, please.
Adepts - Raiding before 65. There's plenty of info on the wiki, so I won't put it here.
Next!~