I realized that it has been asked with some weird titles in Stackoverflow. I can not delete this post cause it already has an answer. if you are interested see following:
Original Question:
I understand that it is possible to remove the Emacs splash screen! (” Unable to hide welcome screen in Emacs “). How can I change this welcome screen with my own welcome screen?
I believe you can use initial-buffer-choice, as documented here:
http://www.gnu.org/software/emacs/manual/html_node/elisp/Startup-Summary.html