What are some red flags I should look out for in messages?

thinking of hiring an escort for the first time. The biggest thing that tells me they're real is the fact that they have multiple social media accounts listed. however they have some downsides. Instagram: privated. Twitter: hasnt posted since February but multiple photos/videos of them. OF: hand posted since February.

To me at least it seems fine. So what can I look for once they message me back? how should I message them as well?