In my opinion there are many benefits blogging in school. Students work and skils become visible, students gets feedback from classmates and also other maybe international schools and also learn to give open good ctitics for each other, student can use mobile for images, shoot their own videos or embed videos from Youtube - so there are many good reasons to start blogging in the classroom.
First video is great tutorial how to create easy and quick Blogger blog. In Livebinders link end of this post there are other blogs like Wordpress and Kidblog. Slideshare presentations give good reasons and ideas to blog in classroom and blog resources links fulfill your hunger of information. There are more than you need to start blogging with your students.
How to Create a Blog on Blogger
Blogging in the Classroom by Silvia Rosenthal Tolisano
A classroom blog and classroom wiki by Fiona Beal
More great blog resources to get you started:
NEW: Reform Symposium Presentation on Student Blogging! by Alfonso Gonzales
Livebinders: Blogging with Students
Cybraryman students blogs
Kidblog.org
Edublogs.org
100 classroom blogs for teaching ideas & inspiration
The Whiteboard blog: Starting a blog: a guide for teachers
7 reasons teachers should blog by Steve Wheeler
65 interesting ideas for class blog posts by Tom Barret
14 steps to meaningful student blogging
Blogging tactical guide
100 reasons why educators should use blogs
The ultimate guide to getting started with blogging!
Blogging in Education: Prezi
Beginner Blogging