Automated Trading NSE

Python script(program) for trading. It would call data thru api from broker SAS or Prostock. Based on data from brokers, program should compute logic, based on logic it should place orders, stop loss orders, modify orders and should trail stop loss orders as per logic. this is an end to end process starting from data fetching, computing logic and checking conditions, placing orders( getting status successful/rejected/partially excuted), placing stop loss order, then trailing the stop loss with multiple underlying. should be able to place orders on multiple underlying for Indian Market ( specifically options in Nifty and banknifty). please do revert with your view on my project and your experience in this field and the cost.