One of the most important factors of introducing blogging to students is to make sure that you have a selection of strong models before you begin. I always show students the fact that I maintain my own professional learning blog and then I usually will show them a few other classrooms that blog as well toprovide a better context and understanding for them. For teachers who want to do this and are looking to begin their own professional blog and don't know where to begin, I will point them to my post on how to begin: "Blogging With Intention: What To Consider When Starting An Educational Blog".
Below is a sample of the pre-blogging scaffolding that I use to connect students' classroom experiences with beginning to publish work online. This introduction to student blogging is based on Pernille Ripp's "Paper Blogs: A Lesson in Commenting on Student Blogs", which was published in September 2013.