First all welcome to Elive.....you won't regret it once you are up and running.
Be aware that simply copying over will not suffice. You need to "write" the image to the flashdrive to have it bootable.
Three are GUI and commandline tools for that in Windows and Linux.
See:
https://www.elivecd.org/ufaqs/tools-to-record-elive-linux-in-an-usb-drive/
Don't hesitate to ask here, on the forum if you get stuck in any way
