If installing to an internal drive you wouldn't need to use the USB-To-Go customised version of Windows - which is specifically designed to install Windows on fast USB flash drives, external HDD's or SSD's. This article covers a non-standard install of Windows 10 onto an external USB SSD, but I don't see why it wouldn't work (with some tweaks) to install it as the only OS on a Mac internal drive, if you're absolutely sure you don't want to use Mac OS. See - It's guided and you can't really go wrong. The setup wizard will guide you through shrinking the Mac OS partition/s to make space, and will create an installation media with the correct drivers for the Mac hardware slipstreamed into it. Setting up Windows with Bootcamp will be the easiest option if you have the space to do it like this. A problem is that Apple were never particularly generous with storage space unless you paid extra, and many of them came with just 128 GB SSD's, which is barely big enough for Windows 10 on its own IMO, let alone as a dual boot with Mac OS. If it's more like a base level 2013 MacBook Air with dual core CPU and 4 GB RAM it will be slower, but potentially usable if you're not too demanding. I am using it on a 2014 MacBook Pro 15' with Core i7 and 16 GB RAM and it's absolutely fine. Some Macbooks from 2013 will be perfectly capable of running Windows 10.

Once installed it's possible to boot into Windows by either holding down the Option ( ⌥) key when the Mac first turns on, or by using the Startup OS option in the System Preferences. It automates and eases the procedure for installing Windows as a dual boot option. Bootcamp does not install Windows to run 'under' MacOS in an emulator or VM (at least on Intel based Macs) - it's a 'bare metal' install.

Dual boot hackintosh windows 10