To get started with juju potions you'll need vine herb seeds for the herbs and the secondaries for making the complete potions. You can obtain those by talking to the Witchdoctor at ;;home and buying some Marasamaw plant traps.   Then ask him to teleport you to the jadinkos. They can be caught using the plant traps (in a similar way to box traps) and yield various seeds and/or secondaries. God jadinkos are special they can drop harmony moss seeds, and are only available for a set