So finally, I found a way to publish english content on my blog, separate from the french section. I'm gonna use it for the #ETMOOC (Educationnal technology Massive Open Online Course) that I will do this winter.
I love Drupal, but it's quite complex and it takes time to learn new stuff. But I figured it out, using content type and taxiconomy.
Look forward to use this part of my site to connect and share with my english collegues of the world!