I'm planning on making some new "outpost" or just market,something like the galactic market mod,but for my stuff I just want to know how to make that Though my idea is making NPC's that sell stuff instead of individual shop items.
Here are some good resources to help you get started! How To Create Your Own Mission/Outpost (I would suggest using this tutorial to set up your files, but use Tiled to create your dungeon, it's much more intuitive) Tiled Modding Documentation Good luck