Hi there, welcome to the Chrultrabook community!
I would say walking through the different pages of the Docs would be a good place to start, and reading up on anything you may need. If this device isn’t enterprise-enrolled, you should be free to start tinkering with it!
According to the docs, your machine uses the CR50 method for firmware write protection, so I’d recommend opening it up and disconnecting the main battery, then plugging it in and continuing with the process starting on the page below:
Once you’ve gone ahead and completed the step on the following pages that tells you how to flash full-rom UEFI firmware, I recommend plugging the main battery back in and screwing everything back together.