You can convert the content type which you created manually into a Drupal module using Features. First, download and enable the module.

1. Go to Administer -> Site building -> Features and click Create feature.

 

2. Fill in the module information.
 

3. Select your content type as component, the dependent components such as CCK will be colored in blue on the right. So make sure you include all dependencies as components.

 

4. Click Download feature and you will get the module.
 

Done =)

Reference: Drupal Module – Features