Find Glowstone in the Nether
Travel to the Nether using a Nether Portal
Locate Glowstone clusters hanging from Nether ceilings or structures
Mine Glowstone with a tool enchanted with Silk Touch to collect the block
Mine Glowstone without Silk Touch to collect Glowstone Dust
Craft Glowstone by placing 4 Glowstone Dust in a 2×2 square in the crafting table
Use Glowstone blocks as needed for light sources or crafting recipes