First, check this FAQ about the application process itself;
Once we’ve onboarded you, we may offer her a Solo shoot first. This helps us get to know her, before we pay for fly and accommodate both of you to a city where we make the shoot.
This may not be a requirement, and like all the shoots we make, you choose if you want to participate or not. Refusing a Solo shoot for her may mean we cannot offer a girl-boy Production shoot right now for logistical reasons – but a Postcard may be a possibility.