If you install an easy one like Ubuntu, Linux Mint, or Manjaro, you don’t have to worry about space division. In their installers you can choose “Install alongside Windows” and you’ll be presented with a very user friendly sliding bar with Linux on one side, and Windows on the other and just drag it to wherever you feel comfortable. Just make sure you don’t move past how much free space you have available.

Distributions like Ubuntu (versions 20.04 and above) automatically install your drivers if you use an Nvidia graphics card. Just make sure to check the “Install third-party software for graphics and Wi-Fi hardware and additional media formats” box.

As for the benefits, you’ll get to know them more as you use Linux more. One reason is that drivers for hardware are included in the Linux Kernel, so a lot of devices are just plug and play that require an installer on Windows. There is more community support than Windows, as the system is not a black box, people who use it and offer support to other users on forums know more about how the system works and can provide much more direct help instead of guessing at the issue.