In case you're still looking for an answer:

-Create a bootable usb flash drive with your os of choice: Download rufus, get iso file of os, flash the iso to the usb drive via rufus. (Unfortunately need a pc for this part).

-Put usb drive to your notebook and turn it on.

-Most notebooks should automatically start from that usb drive. However if not: your notebook brand should have specific button for that (Eg.: ESC, F2). You can google that and find out… OR choose usb drive as first boot option in your BIOS.

PS: If windows asks for key on installation, skip that part and use Microsoft Toolkit to activate it later ;)