This is a simple recipe so don't worry. You can get flint from gravel, when you destroy gravel blocks they occasionally drop flint. You also need one iron ingot, which you can get by smelting iron ore in a furnace.
When you have these two things, open your crafting box (your inventory crafting square or a workbench both work fine). And put the two diagonal to each other. If it doesn't work, try putting them the other way around.
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you craft it with stee ingots to make a flint and steel which makes fire.
Craft one flint with an iron ingot( think about the name
Flint and steel are in the "Tools" section of the Creative inventory.
most possibly lightning but the rain will extinguish the flames. your minecraft is possibly giltched.
It is impossible to get flint and steel in creative mode on Pocket Editions unless you have a mod.