Help

[microzooms]

hello everybody

I'm starting with Tyflow. I wondering if someone can help me set a scene.

I am trying to do something simple like the picture below, I think. A large sphere with some mini spheres with differents sizes in random moving over the big one.



1- I don't know how to do that the position of the particles is over the mesh because using offset control the little particles are flying

2 - when I use object bin with 0 friction, the particles not moving even if apply spread or rotation random 3d 

I saw a lot of tutorials but a can find something similar.

Thank You in Advance.