A starting point would be your-store.com/emails/email_template_welcome.html
Type: Posts; User: frank18
A starting point would be your-store.com/emails/email_template_welcome.html
Well, you really don't need to edit any file.
In admin go to Discounts > Coupon Admin (found next to the Tools link) and set up your discount coupon there.
Next, go to Admin > Configuration GV...