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QEMU does not provide VM manager like VMWare, VirtualBox and etc - meaning it requires to run the necessary things like command line interface. 

QEMU Command Line Example to Create Windows VM on WIndows 10

Below is an example to create an image by command line interface.

"C:\Program Files\qemu\qemu-img.exe" create windows.raw 20G

If you want to create in qcow2 with 2048G disk space, you can create it as following:

"C:\Program Files\qemu\qemu-img.exe" create -f qcow2 centos7.qcow2 2048G

You will need to install operating system, and below command line example shows how to install it by CD-ROM driver - it is actually linked to iso image you have.

"C:\Program Files\qemu\emuqemu-system-x86_64.exe" -m 4G -cpuhda hostcentos7.qcow2 -smp sockets=1,cores=2,threads=2 -cdrom Win10_1903_V1_Korean_x64.iso -drive file=windows.raw,format=raw -enable-kvm

Once installation is done, you may not need CD-ROM driver any more, so you can simply run your virtual machine like below - it also shows how to use audio device.

"C:\Program Files\qemu\qemu-system-x86_64.exe" -m 4G -hda centos7.qcow2 -enable-kvm -cpu host -smp sockets=1,cores=2,threads=2 -drive file=windows.raw,format=raw -soundhw all

QEMU Command Line Example to Create CentOS 8 VM on WIndows 10

Below is an another example to create CentOS8 image

"C:\Program Files\qemu\qemu-img.exe" create centos8.raw 100G

Setup QEMU on Mac

brew install qemu

QEMU Command Line Example to Create Windows 10 VM on Mac

qemu-img create -f qcow2 windows10.qcow2 512G

Below is for OS installation

qemu-system-x86_64 \
	-m 4G \
	-vga virtio \
	-display default,show-cursor=on \
	-usb \
	-device usb-tablet \
	-machine type=q35,accel=hvf \
	-smp 2 \
	-cdrom ~/Downloads/windows_10.iso \
	-hda ~/Documents/windows10.qcow2

Below is to run windows 10 VM without cdrom

#!/bin/bash
qemu-system-x86_64 \
	-m 4G \
	-vga virtio \
	-display default,show-cursor=on \
	-usb \
	-device usb-tablet \
	-machine type=q35,accel=hvf \
	-smp 2 \
	-hda ~/Documents/windows10.qcow2

If you want to use full screen, just add -full-screen in the parameter.

To run windows in the background without displaying anything on the terminal:

#!/bin/bash
pkill qemu
qemu-system-x86_64 \
        -m 8G \
        -vga virtio \
        -usb \
        -device usb-tablet \
        -machine type=q35,accel=hvf \
        -smp 4 \
        -hda ~/Documents/windows10.qcow2 \
        -device e1000,netdev=user.0  \
        -netdev user,id=user.0,hostfwd=tcp::3389-:3389 \
        -display none &

Run QCOW2 image without GUI

...

$ qemu-system-x86_64 -m 8G -smp cores=2,threads=2 -hda centos8.imgqcow2 -device e1000,netdev=user.0 -netdev user,id=user.0,hostfwd=tcp::80-:80,hostfwd=tcp::20022-:22 -display none

If you run your virtual machine above, you will be able to connect to your server via ssh by ssh 127.0.0.1 -p 20022, and you can connect to your web server in VM by lynx http://127.0.0.1:8080