Now most of the apps will be stored on this SD card. However some won't and that's when you'll start running out of space. But that's not the case. Hidden inside is the option to move these apps to the SD card as well (along with the entire data and obb files). This is what you gotta do:
- Go to Storage & USB
- Go to Internal Storage
- Go to Apps
- Select the app
- Select the option 'Change' and select your SD Card and then select Move from the 'Move Authenticator' and it's done!
Mind you, that the pre installed apps and the bloatware cannot be shifted this way. However it won't matter. you will still have around 900 MB free and even if the pre installed apps take up cache space there is plenty of space.
Edit: Restart your phone after that otherwise the partition won't show up if you connect your phone to the PC.