3D clothes and avatar (using python, node.js and three.js)

I'm designing a wearable game that 3D avatar can put on or take off 3D clothes. Avatars and clothes are designed based on Blender (3D program)

Here's two questions

1. How can I save 3D avtar by running the python script after running Blender on linux using a python script

2. How to run three.js on the express server using nodejs to take screenshots of avatar wearing clothes and save them on the server

please help me!