See my blog post where I take you step-by-step with relevant snapshots covering the following:
a. Converting InfoPath Data Connections to DCL library in SharePoint.
b. Publishing InfoPath form to a SharePoint List/Library
c. Creating a .wsp solution package for the InfoPath form and its code-behind
d. Creating a batch script that will deploy the InfoPath form on your Production site.
e. Ensuring the InfoPath form has been deployed as a feature
f. Modify the DCL's in the production environment.
g. Associate the InfoPath Content Type with the Document/Forms Library
See the full blog post at: http://www.sharepointfix.com/2009/12/infopath-2007-form-and-nintex-workflows.html