If you are trying to code this yourself, all the info you need is in the WordPress Codex – http://codex.wordpress.org/Template_Tags/wp_list_pages#List_Sub-Pages
Alternatively you could use a widget like the BE Subpages Widget
If you are trying to code this yourself, all the info you need is in the WordPress Codex – http://codex.wordpress.org/Template_Tags/wp_list_pages#List_Sub-Pages
Alternatively you could use a widget like the BE Subpages Widget