A Bit Boring? Maybe. But if you’re not doing this, you’re dead in the water…
Google Support Document On Tracking Form Fills:
https://support.google.com/adwords/answer/1722054?hl=en
Hire a tech person to help you with inserting the tracking code:
http://upwork.com
CallRail support document on passing call data to AdWords:
https://app.callrail.com/companies/187161840/google_adwords