Step 1 : If you have created a page with name “Blog” and assigned “Blog Template” for that page.
Step 2 : You can set the sidebar from Blog Options -> Layout, which is below the editor.
Step 3 : You can disable the author info from Blog Options ->Post Meta Options -> Disable the Author info.
Step 4 : So now all the blog posts which is shown in this “Blog” page wont show the author info. You don’t need to set it for individual posts. Also this page will have the sidebar which you choose in point 2.
Step 5 : Thats it…
Note: If you create another PAGE, you need to do the above settings for that page too, for getting the same result.