Windows 10 Help for installing

Basically, bought a new laptop which did not come with preinstalled windows. I wanted to download a windows 10 (installer?) Onto a usb-stick, but since it was in Fat32 format, it did not allow any files larger than 4gb on the drive, i formatted the drive to ExFat to allow me to put the 5.4gb windows installer .iso file on there. But now I read that when a usb-stick is using ExFat format, it can not be used to boot off of. Can anybody tell me where I get it wrong. It cant be impossible, right?