Custom Objects in Marketo
I'm hoping that this is a stupid question and easily answered.
I'm experimenting with Marketo's REST API, and familiarizing myself with the documentation. I just got to the part about Marketo custom objects (Marketo REST APIs: Custom Objects » Marketo Developers )
I see that I can get a list of, or create/update/delete records for a particular custom object. However, how do I create a new type (class?) of custom objects to begin with? For example, according to the documentation, I can create a new "car" with the VIN number, make/model etc. by making an API call to <REST API Endpoint URL>/rest/v1/customobjects/cars.json. But, how can I create the custom object "car" in the first place?