1.Decide what your blog is going to focus on.
2.Choose a blogging platform : You can choose from free platforms, like: WordPress.com, Blogger, Tumblr, LiveJournal, etc
3.Create a new blog
4.WordPress has so many different options of themes , choose your favourite one
5.Then write about what ever you want to
6.You can also follow other blogs
7.But the most impotant thing : have fun