Can anyone help me with glazing?

[Leslie Bohoss]

Hallo !

I have painted my first picture. The underpainting is ready.( Better said: I'm satisfied as first one.) Now I'm afraid to ruin with the false glazing.

For example: If I decide to paint the skin tones with Cadmium Yellow, Alizarin crimson, Ultramarine, which is the first, second, and so forth, layer? Or doesn't it matter? Or should I be mixing out first the right tone, rather than glazing with it?

I have Liquin, which is the consistency of glazing paint, like watercolor just not dropped.
So I understand glazing: keep the form and color separated.(I see this somehow total normally.)Meaning that, if your underpainting worked out, then you should layer "only" (almost mechanically) your transparent paints?

Can I alter something with glazing (and after) or only with difficulty?

I said, I'm a greenhorn. I need a kick for the first step, please.