If you are camping, or are lost in the woods, the most important thing to your survival is warmth. I don't know if you have ever done wilderness survival training with out a sleeping bag or tent, but let me tell you, without a fire mine was cold. I wasn't allowed to make a fire, but if I ever need to I can, and you need to be able to make one also or you could die.
Disclaimer: I will never say that fire is a bad thing. It saves lives both from cold and boredom when camping, but if left unattended or used inappropriately, it can be dangerous and unpredictable. Don't be stupid.
Step 1: Tools
You always need the right tools, whether your camping, going on a hike, or just away from safety. If you are in any of these places with out at least some of the following, only you can be blamed for your death.
A knife, good sized and strong
Flint and steel(Sorry, no picture),
9v battery and steel wool,
The matches should include both strike anywhere and light when wet, you could need either.
I suggest you have all of these, they are light weight and can fit in your pocket.