Create a new users command

Hi all, I´m new to MAM and I have very little programming skills, anybody knows where I can find information on creating new users commands?

Example:
Like !kicklaggers
to call a funtion wicht kick every player with more than 100 ping.

I have a php with this

<?php
$mod->registerCommand("kickthemall", false, "ktm");




function ktm($param) {
                 	kick them all code
}




?>

Also any guide on creating custom php plugins is welcome.

thanks!

update; I tried the example on my server and works fine.

Another quick question, what is the command for say something to the player?

Like !myping , and say to the player his ping.

thanks!