A MUSH needs to be hosted on a server. You have several options available.
Most MUs are hosted on a cloud server. This is the easiest way to make your game accessible to the public. It’s more reliable and secure than trying to host it on your home network.
Note: With a built-in web portal/wiki, a database and more advanced coding tools, Ares cannot run on the limited accounts provided by most dedicated “MUSH hosting” services. You’ll need a Virtual Private Server (VPS) where you have admin privileges. I recommend Digital Ocean. It’s what I use for AresCentral and what the automated installer is designed for.
Running on a local computer is not recommended for hosting a real game, but it can be useful for coding and testing. See Setting Up a Development Environment.