What is the minimum dielectric between two planes?

The minimum dielectric between two planes is 3 mils.

What is the minimum annular ring on finished boards?

The minimum annular ring on finished boards is 2 mils.

What are the annular rings for inner and outer layers in the working Gerbers?

In your Gerber files, you should have a minimum annular ring of 6 mils for inner layers and 7 mils for outer layers.

What is the minimum plating inside the hole (PTH)?

The minimum plating inside the hole is 1 mil.