Sidebar removal

Hi! I am using the theme Canard under WordPress 4.4.2. And my website is http://www.thesocialface.com.

I was wondering:

1) How to remove the sidebar from my website ?
2) As you might notice, the first articles and last ones on the main page don’t appear the same way (first with images and title on it, others with small image and beginning of the text). How can I have all of articles presented like the first ones??
3) After I remove the sidebar how can I have my content with full width?

Thank you so much!!!! I am beginning in this, this is so nice to have such a helpful community.