Build a Website for data collection

I would like to get someone who can develop for me a flashy and decent website that my customers can use to collect data for their research works (business, academic etc). The website should be used to create a pool of people (respondents) who will be readily available to fill in data collection "forms" posted on the website by clients. Many people find data collection to be a very challenging task especially when they target specific demographics. I want to use the website to create a pool of thousands of people of different demographics-age, race, religion, educational level, social status e.t.c. I will then use the pool to fill in data collection forms and pay them some money for doing so. The clients who will be collecting data on the website will specify the specific demographics they are targeting -and the website will automatically sort out the demographics for them. Part of the money they pay for the data collection will be paid to the registered members who participate in the data collection process. After the data collection exercise is completed i.e when the number of required respondents is already received, the form will automatically be deactivated. The customer will then download the form for analysis. Who can help out?