How to get more assets?

By making them. You can create 3D models with blender,maya or 3dsmax. For 2D I would suggest gimp or photoshop.

Gimp&Blender are both free.

how can I get more assets?

Here you can download more assets:

  • ://www.blendswap/
  • :///
  • ://tf3dm/
  • the demos from epic games
  • ://www.cgtextures/
  • ://texturelib/#!/category/?path=/Textures/rock/stones
  • or as DoctorPC said, create them with a 3d program :wink: