The Fletcher villager trades sticks in Minecraft, usually at the novice level, commonly buying 32 sticks for 1 emerald.

Quick answer

If you want to sell sticks for emeralds, look for or create a Fletcher by placing a Fletching Table near an unemployed villager.

Helpful note

Fletchers are one of the easiest early-game emerald sources because sticks are cheap to produce from wood or bamboo.

If you want, I can also tell you how to get a Fletcher fast or how to make a stick farm.