It is very important to remember that a computer is a useless piece of metal without an operating system. You will need to install some operating system if you get rid of Windows.
Also, you can not delete Windows from inside Windows, you have to be outside of Windows to delete it.
For all of this I highly recommend some flavor of Linux.
all you need is boot from the windows 10 dvd or usb stick. you can use diskpart commands to wipe the drive after you get to the c prompt or you can in advance mode delete all of the partions then exit the installer using f3.