There is no step by step guide that is guaranteed to work for everyone/you specifically.
You will need to learn to use Winlator yourself and figure out what works on your phone and what does not.
Firstly check your phone hardware, if its not Adreno gpu (preferably a decent one or a gaming phone) then do not even bother trying.
Like i said, try running the game at all first. Post your hardware specs/phone model. See how far you can get by learning what Winlator is and how to use it.
Check this youtube video for very basics, it should get you somewhere, but note that the 9.0 version of Winlator does not run as well as 7.1.4 glibc version for Imouto Fantasy game.
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Follow the video except for the winlator download go here:
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I also updated the guide post today that is linked in my signature
\/ Down there \/. Mostly made it a bit more organized and readable, and also added this same video guide at the beginning. Like i said, i cant help everyone personally, you have to learn stuff yourself. I can only help with specific questions about devices and versions and help with problems that you encounter.