Thank you for the best answer vote.
You're up and running for now, however, I still have one more thing for you.
It's generally recommended to have your OS (Windows 10) installed on the faster drive (M.2).
If it is a PCI-based M.2 drive, having the OS installed on that versus a standard SSD, should make things feel quite a bit quicker.
It's kind of a process, but it might be worth your time to research that a little bit.
So, in summary, install Windows on the M.2, files and games on the SSD (or hard drive).
You may install a couple of key applications on the M.2 drive as well, just depends on the space available.