adding SI7021 to pixhawk i2c

Hello guys.. 

i have a plan to adding SI7021 humidity & temperature to my own pixhawk, data transfer via telemetry 433MHz. so we can make any interface on PC to read the sensor's data. 
would you give me suggest what should i do first? or any tutorials / forum's discuss i can read?

should i make SI7021's library first then editing the pixhawk main code?

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