Hi Doc, Check these handy HQ guides, the wiki is also a good source of information.
http://fonline-aop.net/forum/index.php?topic=1124.0 - Brahmin Boy HQ Guide.
http://fonline-aop.net/forum/index.php?topic=496.0 - V-Tech HQ Guide.
http://fonline-aop.net/forum/index.php?topic=1284.0 - Family HQ Guide.
http://fonline-aop.net/forum/index.php?topic=902.0 - Lawyer HQ Guide.
-I'm not 100% sure if any merchant sells bloodmoon, it can be found in the core. Be sure to give your faction medic a check just incase I'm wrong.
(See the guides for location of your vendors)
-You can change factions, there is an NPC at your base with the option to leave faction. Upon leaving you will be able to see you immediate enemys base on the world map.
-You can buy CAMKIII from you high end faction vendor (See the guides) This vendors stock will improve with zones controlled by your faction.
-Doctors bags and FA kits have a chance of being used up every time you use them, I
think this depends only on your DOC/FA skills.
Maybe also your luck.
-"
Zone control" is a really good way to obtain exp, but at the same time it is not guaranteed.
Assignments seems to be the best way of obtaining a steady and substantial amount of exp.
Mix this with some scavenging and crafting, You will be level 24 in no time at all!
Good luck, welcome to Phoenix.
See you in the core.