PSoC Creator 4.2 have loads of BLE examples for the PSoC 4 BLE Pioneer kits, such as CY8CKIT-042-BLE for example. I suggest you work through some of these first.
Then install and use a BLE utility app, such as nRF Connect, for example, to see how the PSoC program communicates with your phone. These type of apps give you all sorts of information about the GATT service UUID and associated Characteristics.
Then I suggest you look through the forum FAQ section on Bluetooth 4/BLE for tutorials. They may not be for PSoC 4 MCU but they will certainly illustrate which AI2 blocks to use etc.