Unfortunately, there is no way to guide a complete newbie to built this kind of sampler. It's too complicated and full with nuances. The best way I can think of is starting from one of spog's sample based instruments like the one that attached above, learn it and continue the development from there ...

Hello how are you
i am using google translator

I want to know if you can guide me how to make a VST sampler like this: https://decomposer.de/sitala/

I want to put more boxes and be able to throw my audio samples in them.
Thank you so much .
Anders.