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If you can see the flash drive in explorer, you can use Rufus to create a bootable device.
Rufus - Create bootable USB drives the easy way
It's entirely normal for Win 8 to require that you enter a license - of course you can skip that and enter it later.
With Win 10, MS moved on to record that your PC is licensed, once done, on its activation servers, making future activation on that PC automatic.
Using disk imaging (strongly recommended here) allows you to quickly recover from many types of failure without technical help (even disk failure). We recommend Macrium Reflect (free), but there are other such programs.
I've run Win 10 for about 6 months since getting this laptop without real difficulties, but I know that's not been everyone's experience- else this forum wouldn't be so busy.