Hey guys! This is my very first thread and I'm very happy to join this community.
I've been browsing the forum and freelancer.com for several weeks but still I haven't figured out what I need to specify as requirements in my job project post, to receive more focused and better bids from freelancers.
So, what I am planning to have developed is an adult content high-end female escort website. The purpose behind this project is to get rid of agencies and to give escorts full control on their clients selection and schedule.
From the escort side, they need to be able to post their ad, pictures and so on and they would also need to be able to modify some features such as a calendar that is ultimately shown to the client. This is just a brief introduction to some of the features, I prefer not to undercover all the aspects of the project

From the client side, they need to be able to: research available escort for a certain time or day(the search relates to the calendar) together with the range of prices and so on, they obviously need to see escorts' profiles.
In addition, a feedback system needs to implemented for both parties.
The design should be attractive but not source of distraction, the focus is all on the escorts, it should be intuitive and neat.
The service is not for free for escorts and the cost depends on the package they select, so I would need to have some sort of payment process.
Since I am a newbie in terms of web development and design, what I am kindly asking is how to represent all this in the job project posting on freelancer.com? Which requirements do I need to clarify? Php, Html, MySql and/or what?
I don't want to misdirect freelancer so I would like to have this part clear, for the good sake of both parties.
Much appreciated guys!!!
Nicolo