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I would like to start a website where users select their criteria and, after searching in the database, get access to the most relevant answers (similar to property guru). There will also be a feature where users (they need to sign-in if they want to access this feature) can get each other's contact (they need to pay online (PayPal?) to get each other's email).
I need the architecture of the website and database, but want to be able to upload all the data in the database myself, as this is a big work (I will need several months to do it).