Install libvirt, qemu & dnsmasq (used for dhcp)
apt install qemu-kvm libvirt-daemon-system libvirt-clients bridge-utils virtinst qemu-utils dnsmasq
Enable & start default net interface
virsh net-autostart default virsh net-start default
Install cockpit & cockpit-machines ( web interface for managing virtual machines )
apt install cockpit-machines cockpit
Then open https://ip-address:9090 in browser.