Plz tell me how can i DEploy &Run my frist php program"mypage.php"

Depends on the server you are using . for example .if your are using Easy-PHP package which contains apache server . You put your file at www folder and then run http://localhost/mypage.php

If your doing it from a home machine, youll need to install a webserver first and foremost. Of course Apache is the number 1 choice and there are tons of resources to help you along with that. I would check out winamp for windows, if your running windows. Its a 1 step package that includes Apache, php and mysql installation to get you started. Once its installed, you should be able to open any .php file with your browser and view the contents.

@Xyle , thanks for your addition .