With this fork first setup you can get a feel for what Jekyll is like extremely quickly. Make sure that you rename your forked repository to yourgithubusername.github.io. It can then be viewed at that URL.
Your site is customized and looking great. Now you just have to write that epic blog post! We're going to edit the existing Hello World post for your first post.
To add additional posts you can hit the + icon in the _posts folder (shown at the end of the video) to create new content. Just make sure to include the [front-matter](http://jekyllrb.com/docs/frontmatter/) block at the top of each new blog post and make sure the post's filename is in this format: year-month-day-title.md
If you'd like me to let you know when I release a new theme, just [drop me your email for updates](http://getresponse.com). I'm currently working on a personal portfolio site Jekyll Now theme.