Selling diesel parts and supplies

[Mopar1973Man]

I've done it in the past and it worked but now with all the new changes I can't find the information for rebuilding a custom email. In the past I started to sell a product from my vendor. So every time a customer bought this item it sent a email to the my vendor and had shipping info and the list of the invoice for the supplier. 

Currently I've got the old stock email but need to add in the invoice info like product bought, and mailing address to the customer. 

As fro the variables you can use I know there is more but what is valid and where to find a current list?