sales Orders categorization

 Hi,

      My requirement is to show total number of sales orders , 3rd party customers orders, internal sales orders and web orders. All these volumes to be shown in report. I am depending on the count of header_id from sales orders. I am going for 3rd party customers orders based on the customer type -- external ...for web orders based on the order source id correspond to web, for internal orders based on the order source id for internal. Am I doing the right thing or missing anything? My another doubt is cann't we  use the customer type as Internal to get the