The simple answer to your question is: “By doing it!”. 
But this answer isn’t helpful.
I never did traditional inking to create art, but would imagine the pens you mentioned could be somewhat similar to those I had to use as a technical draftsman in the past, maybe these are the same pens.
To recreate a real-world-pen or brush from scratch in Krita, you need to know the brush engine well, need to know what does what. Therefore, I recommend to you the current videos from @RamonM about Krita’s brush engine(s) and brush-making:
Usually it is a good idea to look at existing brushes with characteristics near those characteristics you want to achieve, to see how they are made, what settings are involved, maybe to modify them to see what change does what, to get an idea of what does what. That is because brush-making is a continuous process of trial and error, constantly going one step forward two steps back until you are satisfied with the result of the work done.
If you are a beginner in digital art and want to jump-start into brush-making right away, then it will be a hard task to begin from scratch to make your own brush mimicking another brush, and I recommend to you to find brushes that are near to the one you want to build, to study and understand them. As implied above, play with their settings, get familiar with them, understand what which setting does.
If you need more sources for brushes to study than those who ship with Krita, just ask for them or take a look into the resources-category of the forum. There you can find “Basic inks and brushes” from @Pandenova_studio and more. The “Jarry H. Line brush set” (this is a link to the download-location) may be of interest too, if you want to create such pens, the link is from my post in this topic → Jarry H. Line brush set, where users asked for this set, it is the most requested download I offer.
If that is not enough for you, work your way to the resources I linked in the following post, but that are not only sets for inking, often these are for general purpose and may contain inking-brushes:
Michelist