How did a new satellites get in the right position?

Collisions with each other. Orbits come long, long after particles have begun to clump together into hydrogen atoms.They don't just "start" to move in orbits. Objects that intersect the gravity wells of massive objects at the correct distance and vector enter orbits. Other things don't and they shoot off into space.It's hard to understand what you find puzzling about that. When you look at objects in orbit, you're obviously only seeing the objects that had the correct position and speed to enter orbit in the first place. Obviously, everything that didn't never entered an orbit, so you don't see it when you look at orbits.What's hard to grasp about that?

No, not at all. They're constantly colliding and interacting with each other, having their straight paths deflected, etc.