You may check these 2 helpful posts from @balmung regarding investing through a GmbH
The GmbH has to be alimented with CHF 20 000. This is your trading money and will remain in the company.
Additionally, you will have to understand and follow the corporate rules of a GmbH (annual meeting with yourself etc.). This is not complicated, but crucial.
This link (in german, google translate should work) can give you an overview.
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