Start by paying someone for hosting. That's enough to learn about. Maybe start by paying Amazon nothing for a year of EC2 hosting. Once you understand how to host a website, you can migrate it to your home computer, where you will run into additional difficulties, like installing a base webserver and automatically updating your DNS. But probably you should stick with paid hosting. For static files, Amazon S3 is extremely cheap. For a full-fledged webserver to install your wiki, Nearly Free Speech will do, and is probably cheaper than Amazon, especially at your usage level.