I used to be friends with dudes who did Skyrim modding and they said anyone who wanted to get in to modding shot create a small area. Have a quest with triggers, spawns enemy, reward is new weapon, Simple formula that teaches you the basics.
It would be cool if the guys who liked the isometric Fallouts could play those on a fps/tps engine. Then guys who liked the newer Fallouts could play those on an isometric engine.