Following on hikermor's line of thought, it is important to know what is allowable in your area. There are really three different scenarios you could face:

1. You have access and can legally use deadfall for your fire ... for this you can follow the exact method from the image I posted. As hikermor mentioned, this can be done with no tools, but a simple knife might help. That said, a saw and even hatchet (or ability to baton) might be nice depending on the nature of the deadfall you find and how long you plan on having a fire for (bigger stuff burns longer).

2. You only have access to logs or larger pieces of firewood (this can happen in some parks where burning deadfall is not allowed) ... in this case you need to know how to process the firewood into the appropriate tinder / kindling / fuel sizes and have the appropriate tools.

3. You can't have a campfire ... a stove is needed, and maybe a candle lantern for ambience .

Basically, you need to know which situation you are walking into to know how to prepare appropriately.