developing plugin need help in add_aciton

Hi

I am looking for help in my first plugin.

I have done all the things but for now I need help placing plugin output on blog

add_action('init', 'my_plugin_function');

I am using this action but thing is that.. it executes in admin also.. Is there any way that it executes in blog only? like

if ( is_home() ) {
add_action('init', 'wpg_alert');
}

Something like that