It's "site" btw - just an FYI.
Are you saying you imported the Excel spreadsheet into an InfoPath form, and then you published the InfoPath form to a form library so that when clicking "new" you get the form template? then, using submit, you are able to submit that form back to the form library? All of this works?
At what point did you build a workflow to send notifications? you say the email isn't working, but how did you set up an email to be sent? Did you create a submit to email data connection? We need details on how you built this.
As an aside, what I do is create a workflow with SharePoint Designer (free) that is attached to the form library and sends notifications with data from the form and with conditional logic for who it should go to and when.