You don't need to know anything about technology and programming languages. Just tell us what the program should do from the user's point of view. Describe the functions as broadly as possible so that a person who has not heard anything about your idea gets the right picture of your program.
List at least the following:
You will already know what you need, when it is even more straightforward to place an order. Post any materials, mockups, specifications, PSDs, etc. directly to my email address firstname.lastname@example.org. By submitting a request for a quote as complete as possible, it is possible to complete the offer quickly.
It is a good idea to deal with the invitation to tender: