Camping
The Camping skill is used to logout safely when out in the wilderness. It is almost never used, as even new players logout at a tavern or inn, and so is considered somewhat of a Useless Skill. In order to create a camp, you require some kindling and a bedroll. Use the kindling to attempt to ignite it. Once done, in about 30 seconds or so, you - and anyone near near you - will receive a message that the camp has been made secure. Anyone who gets the message (not just the person who created the camp) may then use a bedroll to log out instantly by placing it on the ground, unrolling it by double-clicking it, then double-clicking again to receieve a logout confirmation gump.
Training:
Actually there is no NPC to buy camping skill so either you start to train from 0 by double-clicking kindling or you get a skillball to raise it, if you think you need this skill.