SQL Server 2008 :: Generate Invoice Document For Customers?

i need to generate documents for customers to sign automatically as sales staff enter their data into SQL. These are invoice style documents. I currently have word templates of the invoice documentation, i just need to be able to add the clients names, address etc into the relevant spaces for them to print off and sign.

I am good with TSQL and writing Stored Procs etc and can easily get the data ready - i just need to find a way to populate the templates in the right places and then save a copy for emailing.