Here are some links suggested from bing.ai which can help you to make the first step in your project! 
Chapter 2 - 3D | Babylon.js Documentation (babylonjs.com)
Is it possible to develop this kind of 3D configurator? - Questions - Babylon.js (babylonjs.com)
Roadmap to develop a 3D configurator - Questions - Babylon.js (babylonjs.com)
Pally Pallet Builder | Online Pattern Builder | Rocketfarm
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this one is quit promissing: store.js - nodebox - CodeSandbox