You will receive a confirmation email from Calendly with the link to join the call on Google Meet.
Record a short video saying the following things:
Thank you for booking a call, we will speak at the time you have selected
You should have received the link to the call by email, from calendly, check your spam
Attend the call on a computer and make sure to be in a quiet place
Put a reminder in your calendar so you don't forget
On the call we will ... (restate the benefit of how you will help them), and also mention a few results you've had in the past
This confirmation video shouldn't be long: 2 - 4 minutes max.
About ...
You can write a few paragraphs about who you are, the results you had in the niche and the people you've helped in the past. Keep it short and concise. You can include videos testimonials, and / or screenshots
You can also add extra resources / videos that you have made in the past