You can search the forums there is some stuff like this already there.
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Archive/ discussion of 3D weight gain tricks - Project Help / 3D Modeling - Weight Gaming
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Some notes about RenPy - Project Help / Game Engines - Weight Gaming
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More notes about Ren’Py - Project Help / Game Engines - Weight Gaming
Some people also do workflow videos and study that and the process can help to understand how to go about certain things. People often slow the videos down and follow along creating something. Like this: 【Blender 2.93】メイドラゴン トール 3Dモデリング【Timelapse】 - YouTube