Customizing user's description in comments and forum

Hello,
i have recently installed Drupal and have some questions.
I would like to customize user's description in comments and forum. I want theese things to appear near user name and avatar:

* Count of comments user has posted
* Count of pages user has created
* User ranking if set (eg. Admin, moderator)

Which module does it or do i have to code it manualy?..

Thank you in advance