Collect spefic quotes and add to database

I have number of websites and images where I need help collecting quotes from. Those quotes must be added to database (you will use my website) and there you must first check if the quote is already in database - if so then not add it. if it is not on my site then check if the author (source) is in my database if not then add the source and then add the quote. I will explain in much more detail in private message.