You need four sand and five gunpowder arranged like this:
GSG
SGS
GSG
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5 Gunpowder and 4 Sand
You need sand and gunpowder, crafted like this: S G S G S G S G S S = Sand G = Gunpowder
To create a firework you first need a firework star which is created using gunpowder and a dye (OPTIONAL: extra materials like diamond, glowstone, lapis etc...) Then you Need paper, the firework star and gunpowder (1-3 depending on power) The firework star is placed on the center top box, the the paper in the direct middle and the gunpowder below it you can put more gunpowder in the bottom row if you want the firework to become more powerful.
Throwing potions in minecraft are called splash potions. To make any splash potions you will need to add gunpowder to it by putting it in the brewing stand, like any other ingredient for the potion.
3 iron ingots