But my ssd is a completely new one with nothing inside
You have to create a USB Windows bootable ISO to install Windows on the blank SSD.
That is first step, next is to boot from the USB device to install Windows.
Some motherboard may need to manually boot so depending on the brand.
MSI and Asrock is F11, Gigabyte is F12, ASUS is F8.
Branded PC wise boot menu depends on brand, HP will be more complicated to access.
Take note sometimes USB may not boot as either the drive is partition wrongly.
Or the WIndows USB installer is corrupted.
If you want to save all the headache bring to a shop let them do for you.