How to generate workflow notifications once the sales order is booked

Hai,

How to generate workflow notifications once the sales order is entered/booked Our requirment is explained below We have many inventory items and assigned the same in different division organizations. the item categories are defined like Finished products,Rawmaterials,By products etc...

We need to generate workflow notification once the order is booked for particular category item like Raw material and send the notification to some workflow user which also we need to define in system.

If any option available in system to generate standard workflow notification once the order booked.

If any body have idea kindly share the same.