If you want to test if the sensor is connected to the I2C bus, run the i2c_scanner. Google for : arduino playground i2c_scanner
In the Playground section is code for the MPU-9150, you can try that. Google for : arduino playground mpu-9150
Next try code (for example on Github) for the MPU-9250. Google for : arduino mpu-9250
The MPU-9255 seems to be made to work with the Invensense AAR library. But I have no idea what is different. Could you compare the registers with the MPU-9250 ?
This topic is "Help with gyro MPU-92/65", but you want code for the Invensense MPU-9255 sensor. You could start a new topic : "Code for Inveense MPU-9255 sensor ?".