Beginner Skill:

This tutorial demonstrates the step by step process for importing static objects into TableTop Simulator. This is ideal for buildings, landscapes, props, and even characters if they are not going to be animated.

https://www.youtube.com/watch?v=iHhBhTtcmoQ&t=5s

Moderate Skill:

This tutorial demonstrates the step by step process for importing (free) Mixamo animated characters into TableTop Simulator. While the tutorial focuses on Mixamo characters, the tutorial process can easily be applied to other sources. The tutorial is about 45 minutes long and has many steps but the tutorial does go through the process step by step so even users with only moderate computing skills should be able to follow the tutorial. Once the user becomes familiar with the process the import takes much shorter to perform.

https://www.youtube.com/watch?v=y3T10OfABGU&t=3s