You should of course have played the game a bit, to get a feel for the types of quests that are in the game right now.
You should have a basic understanding of ATCS or your preferred method of content creation.
You should have a basic understanding of Tiled, the map editor.
You love creating creative content.
Expect to write a lot of conversation text :)
Various areas that might require more instruction for developing Andor's Trail.