Are you trying to use SPI or I2C? All you need to know is in chapter 5 and 6 of the data sheet, so you probably need to read up on those sections. They show exactly how you are supposed to transmit data to and from the device.
Everything seems to be register based (I have just skimmed the data sheet, so there could be more "advanced" options too) so basically you send a read read command to the device and then you read back the data in the following clock cycles.