Customize the post section

Hello,
I’d like to customize my post section from blog looking to a simple site news. I’ve already removed comments and all the categories and stuff on the right column. Now I need to:
– set the post column length to full page (now, on the right side, there is an “invisible” column in which there were the categories and stuff)
– hide the author of the post
– increase the characters limit in the post preview
– remove “show all”, “without category”, “no comments” information

Thanks in Advance.