Visual Studio is not available on Linux and not really working in Wine, sadly. You can use IntelliJ IDEA as a good alternative, it supports Linux officially and has a Flutter plugin.
For a beginner, Linux Mint is perfect. It is based on Ubuntu which is based on Debian, so you can follow most tutorials written for either distribution (like the installation instructions for IntelliJ IDEA or other software that is not available from the APT package manager).
Here is a comment I made in another thread:
For pirated games, I recommend Bottles installed as a flatpak. That's because it has a per-game toggle for sandboxing the app, not giving it access to your complete home folder and optionally no network access or audio output.
Even when using trusted sources, you can never be safe enough. Bottles with sandboxing will at least protect your files from crypto trojans and prevent you from becoming part of a botnet. It should not have any impact on performance.
Remember to put all installer files anywhere inside the prefix folder, otherwise sandboxing denies access to them. After creating an empty game entry in Bottles, check the 3 dots menu for the option to open it in your file explorer.