Automating a Checkout Process

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Javascript

So I'm currently interning for an online ticketing company in the city of Pittsburgh where i'm working in the field of Software Quality Assurance. I have a good grasp on basic HTML coding as well as a slight bit of CSS and Javascript. My boss would like me to write tests for the company using PhantomJS to automate the checkout process for events. I'm very new to this and would greatly appreciate any advice or sense of direction. Up to this point, I've used Selenium IDE to record and automate checkout processes but my boss would like me to start writing my own tests. Example programs would be greatly appreciated so I can better understand what he's talking about.