Minecraft – Does villager keep his trades after zombification

First you need to actually plant the farm yourself. Then you want a fresh villager (child or cured zombie) to become your farmer. Give them 8 stacks of wheat seeds before letting them into your farm. Once they're fully grown let them in. This will let them pick up seeds for replanting and ensure they never get an inventory space to pick up wheat.

Currently potato farms don't work with villagers but this process can be done with beetroot as well. Carrots are a slightly different story.

Edit: also remember that as well as a composter to assign him a job, your villager will need a bed as well.

I think you have to place a book and quill on the lectern as well :)