Welcome to Azure IoT @Inderpreet Singh ,
- The best place to start learning about Azure IoT is here: https://azure.microsoft.com/en-us/overview/iot/
- Then (as I already noticed you have earned some badges) leverage the learning content here: https://video2.skills-academy.com/en-us/learn/browse/?terms=iot
For the scenario you describe I don't think Azure IoT Hub or Azure IoT Central is the best approach. Mostly because "The data is unidirectional" ... Unless you need to connect over MQTT and\or do some computation at the Edge using Azure IoT Edge.
I hope this doc can help you understand why: Connecting IoT Devices to Azure: IoT Hub and Event Hubs