I am not instructing you it its use. You need to use a paid hosting platform that will allow you to select from hundreds of site design themes, as well as add what are called "plugins" and "widgets" to enhance the user experience. So, you will be spending a small amount per month, usually about $8 to $12, depending on the host.
I don't want to recommend any one hosting service. There are many, and this WordPress resource links you to those who specialize in hosting WordPress blogs. All should have a simple install process to get the WordPress software installed on the server. It is a complicated process, so I found it much better to work with one of these listed hosting services for an easy WordPress install.
I'm not recommending any particular hosting service, and here is the WordPress page with specialized hosting. You can investigate them, and I will say that Yahoo also has an easy WordPress install as well. If you're still just entertaining the idea of a community blog on the WordPress platform, then you can move on to the next step to see how to get started building the site once the software is on a server with a domain name. However, if you're ready to get on with it, use the links above and any other resources you can find to select a host. Get signed up, get the domain name, and you're ready for the specifics in the next step.

