Form to send email before processing order.

[can_add]

I'm setting up a registration form on a site that collects users information and then is processed on an off site payment merchant. The only problem is on the original form I'm collecting alot of information for myself that the merchant doesn't require, and I would like this information to email to me and then allow users to make the payment for the courses they have selected on the merchant site.

I know this is possible i just don't know where to start, any insight would be helpful.