step 1: get renpy installed
step 2: jump in and just start editing the default demo game "the question". Begin writing dialogue, copy the code examples in the game there, using the default background scenes and foreground character images as placeholders.
step 3: If you enjoy yourself and think you have a spark of an actual interesting game story, share it with someone and get feedback.
step 4: Try to find some better placeholder images. Don't jump into making art yet, it's hugely time consuming and it means nothing if you can make a good story.
step 5: now take some time to think of the whole story arc, and the gameplay you want. write out a 5 part story outline (the intro, the difficulty, overcoming the challenge, the climax, the ending). Decide how you are going to make it a GAME so the user is not just clicking through text with no choices (unless you want to make a Kinetic novel which is also fine but not so interesting to most)
step 6 to infinity: repeatedly write some story, research some gameplay coding, make or gather some artwork, put it together, test it, release it. chapter by chapter.
first game warning: don't try and make your Ultimate Dream Game on your first attempt. Do something MUCH smaller but maybe in the same theme so you start to get followers who like that fetish (MNWO in your case). target getting it completed in less than 6 months. You will learn so much about making games that right now you don't even know you don't know. Then you might have a chance to succesfully make your dream game.
Regards art: this is the killer for most projects, because it is very time consuming to make yourself. if you have money, considering using freelancers.