Google Ads GTM Conversion Setup

I have a custom-built website with Google Tag Manager already installed and linked to my Google Ads account. What I need now is a clean, dependable implementation of all key e-commerce events so I can measure real performance and optimise campaigns with confidence... (Budget: ₹600 - ₹1500 INR, Jobs: Analytics, Digital Marketing, Google Ads, Google Analytics, Google Tag Management, Troubleshooting)