What are asteroides?

There are major 3 types of meteors. 1) Rocky meteor 2) Metallic meteor 3) a combination of both 1 and 3.

Yes, they even get delivered by little asteroid people in a first delivery space van.

No. Most asteroids in the solar system are in the asteroid belt, but not all. The ones that may threaten to strike earth, for example, are outside the asteroid belt.

Millions, if including very small bodies.

No. Asteroids are scattered throughout the solar system in various orbits, some of which are relatively stable. Some have orbits that pass near Earth. But the vast preponderance of large asteroids...