Okay, if you want to learn about building traffic you need to learn either SEO (learning best practices for Google's model), or how to write content people want to read and feel compelled to refer others to read. That site appears primarily about cystic fibrosis, which isn't a very popular topic. It's fine to have the idea of talking about other things, but if you're taking the SEO route your goal is to be seen as an authority on some specific area of information. Also, having a fully developed site which is set up incorrectly by SEO standards means very little when it comes to SEO. For example, it's sometimes advisable to start from scratch building out page structures, title tags, content, etc. correctly (for example, as I mentioned using a Wordpress structure), and you can often get better results faster by doing this.
That's kind of the long term goal. Only I am thinking webcomic. Time will tell.
A webcomic sounds fantastic! Are you any good? If you can put out something like xkcd.com, then simply add Twitter/Facebook share buttons to it, that can be a quick way to build an audience right there.