Everything you need to know should be in this tutorial. I've watched this like 100 times within the past few years. Saturate yourself in tutorials and you'll pick up many different ways on how to achieve your goal. That way you can pick and choose techniques, ultimately working the way that best suits you in the end.

(replace the words "Platsil gel" with Dragonskin or Psycho paint in this tutorial. They work the exact same)
https://www.youtube.com/watch?v=nY1gpwUyCtg

For powdered pigments you're going to need to mix nearly too much pigment into your part B base before mixing in part A and your thinner. Wet pigments seem to be more opaque in my experience so you can always try a combo wet and powdered pigments. Honestly I have to do multiple base layers before I'm satisfied with full coverage so sometimes that's just how it is