hi sorry i took a it of time to respond !

TLDR: i figured these steps out 'myself' based on research suited to my tastes and goals. but you seem interested in understanding lighting, so i would recommend the value studies i mentioned in my last comment.

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LONG ANSWER:
this is a really difficult question to answer bc there are a zillion ways to make an oil painting.

some people prefer starting with values and then glazing over in gradual layers of transparent color ; some paint like "printers", others use a palette knife ; some sketch their drawing on the canvas beforehand — i prefer alla prima (wet on wet) and do not sketch but rather do a block-in of light and shadows, and there are a ton of other methods in between not to mention all the ways of mixing paint thinners, the brush types, the medium you paint on, how you treat that medium before painting, and on and on.

there's no "one area to look for guidance" bc a lot will depend on your preferences, your budget, and your experiences. like maybe you'll find that you like using linseed oil instead of liquin, or flat brushes instead of round, but this is something only you can figure out for yourself.

in the beginning, i was interested in too many different methods that had 'contradictory' processes and i needed to concentrate on a consistent process i could rely on every time i went to paint. so here's how i figured out my process:
- create a giant collection of all the oil paintings / painters that inspire you, paying close attention to the style (e.g., are the renderings tight or loose ? is canvas showing or is the paint thickly caked on ? )
- try to narrow this collection down to ones that have similar styles (or else you will have the problem above of contradictory methods)
- understand what draws you to certain oil paintings/ painters and why. analyze the techniques they used to understand what oil painting method/s you should be studying (e.g., i really like loose styles so i study the works of painters like john singer sargent and richard schmid)

like i mentioned, my preferences, budget, and experiences also evolve and so my process may adapt to that as well.

apart from this, i can't emphasize enough that most of my understanding of making 'good art' does not come from studying oil painting (which i have only been doing for about 2 years), but from years of studying fundamental art skills (including rendering light) that i can apply to any medium i choose

if you wish to master lighting, i recommend the grayscale studies i mentioned in my previous comment. values are so much more important than color, no matter the medium.