How to buy used car in South FL? help needed

Hi everyone, I’m buying my first car and I’m super confused about the process. I found a used car on Facebook Marketplace and the seller agreed to sell it to me. It's a private sale here in Florida.

I’ve read that I need a bill of sale and insurance before I can legally drive it, but I'm not sure how all the steps go. Do I get insurance first, or after the sale? How do I legally drive the car home? What exactly do I bring to the DMV?

I even drove to my local broward FLHSMV to ask someone in person, but they wouldn't even let me past the gate. The security guard told me they “don’t handle car buying questions” which just made me more confused.

Can someone explain the process step-by-step for Florida private party sales? Like what to do before meeting the seller, during the sale, and after? I just want to do this the right way and avoid any legal or title issues.

Thanks in advance!