I just type some commands below:
$ git clone git://github.com/imathis/octopress.git octopress
$ cd octopress
$ bundle install
$ bundle exec rake install
$ bundle exec rake setup_github_pages
$ bundle exec rake generate
$ git add .
$ git commit -a
$ bundle exec rake deploy
And, write a this file(source/_post/startup-octopress.mkd).
$ bundle exec rake gen_deploy
enjoy!