I had done the same thing with my computer, most computers these days when people build them they don't include a dvd drive. Usually you can boot from external dvd device like portable dvd drive . or alternatively you can always install the Operating System with a USB device by booting from USB but of course you can not just put iso on usb and think it'll work you have to correctly configure the usb. there's a program called https://rufus.akeo.ie/ try using that to create a bootable usb stick. there are other programs you can use free and paid they all have their ups and downs. best of luck.