Creating a simple system that record market turnover automatically

Hi, I am new here. I having an idea to create my own stock/market turnover data recorder in real time with 2 main purpose
1. To calculate the Relative Volume of the stock in real time (30minute basis)
2. To know the current market turnover as compared to average market turnover

Anyone had idea regarding on how should I start to create this simple system?

Thank you
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