One of the best types of tinder commonly available at reenactments is hay or straw. Gather a double handful. Store another double handful. You can carefully shave a few pieces of pitch that has oozed from the bark of a conifer The pitch will flare instantly at the touch of a flame and helps ignite your tinder. Kindling is material that will burn with a little encouragement.
Twigs are the easiest to find.
In damp weather you can often find dead twigs that are dry. You can also split open wet logs and cut off pencil-thick lengths of the dry inner wood. You will need a small armload. Fuel is the firewood you will use to keep your blaze burning. Dry branches lying on the ground are a fine source of fuel.