We have changed to a onepage checkout in our Magento website from a multi-step checkout. Our Goal funnel Visualization is no longer working correctly. We need the steps tracked using GTM for each event such as: user fills out first name in billing, select shipping option etc... Also, we need to make sure Advanced eCommerce tracking is setup correctly. For the right professional, this will not take much time. Please only bid if you are skilled with Google Tag Manager, Google Analytics and implementation of these two in Magento 1.