1
Is there currently any version of Windows or any other operating system installed on the Lenovo laptop?
If there is another version of Windows installed, what version of Windows is that.
2
If there is no other operating system, or if there is a different operating system like Linux on the laptop, then the only option is to create a bootable USB on another working PC on an empty 8GB USB flash drive, then boot your laptop from that USB to wipe the drive and clean install Windows 10.
Click this link: https://www.microsoft.com/software-download/windows10
to download the Media Creation Tool (Click on Download Tool Now), with that you can create a bootable USB flash drive (min 8GB) using that tool.
Then, Boot your PC from the Installation Media you just created to begin installing Windows 10.
During the installation process skip the steps which ask for a product key and select the option 'I am Reinstalling Windows 10 on this PC'.