You can easily manage your Cloud VPS (Start, Shutdown, Restart, Reinstall) through your VPS Control Panel. You can also reinstall windows through KVM over IP same as you install physically.
Yes, you can easily upgrade to a bigger VPS plan through your client Ares without any downtime.
You can select from a wide range of popular Linux distributions (CentOS, Debian, Ubuntu, and many others) and Windows Server.
Yes, You can get Paid control Panels like cPanel, DirectAdmin, Softaculous as an addon.