Help with google tag manager:
http://www.lunametrics.com/blog/2016/09/22/tracking-form-field-values-google-tag-manager/
http://www.lunametrics.com/blog/2016/08/04/beginners-guide-triggers-google-tag-manager/
http://www.lunametrics.com/blog/2016/03/07/google-analytics-and-google-tag-manager-debugging-tools/