How to make a module in drupal

Steps

1) Create a folder in drupal directory

        C:\wamp\www\drupal\sites\all\modules
             --folder name firstmodule

2) Create a two File .info and .module file
          -- Your .info and .module file name same as your folder name

firstmodule.info file Look

name = First Module
description = My First Module In Drupal
core = 7.x


firstmodule.module file Look

        -- create a hook menu in my module file

function Users_menu() {

$items['testing'] = array(
'title' => t('My First Module In Drupal'),
'page callback' => 'testing_module_block_view',
'access callback' => TRUE,
);

        return $items;

}

      -- create a block using hook_block_view

function testing_module_block_view($block_name = '')

{

     -- create a form using drupal_get_form

$form = drupal_get_form('Testing_form');

$block = array

(

'content' => $form,

);

return $block;

}

    -- your custom function 

function Testing_form(){

$Hello = "Hello World";

return $Hello;

}

// My Module its Complete 

-- go and active your module