Find a jungle biome
Break cocoa pods from jungle trees to get cocoa beans
Craft or gather jungle wood logs
Place jungle wood logs on the side of blocks
Right-click the side of a jungle wood log with cocoa beans to plant a cocoa pod
Wait for the cocoa pod to grow through its stages
Harvest the cocoa pod when it becomes large
Replant cocoa beans on the same log to keep farming
Use bonemeal to speed up cocoa pod growth
Build multiple rows of jungle logs for larger farms
Collect harvested cocoa beans into a chest or storage system