How do I disable unnecessary Iphone data??

[Sophia]

Hi my name is Jen and. I recently upgraded to the iphone 4s 16 GB and my usage says this so far: Storage 13.0 GB available and 588 MB used. (Is this good?) I really hope I didn't go over the limit or anything. I don't have any music, games, pictures (etc) and I didn't play any games, go on the internet, email, launch siri or any type of apps because I'm on a tight budget at this time. I heard about turning airplane mode off along with cellular data and I turned off a lot of things. ( So far all of these things are disabled my phone: Facetime, Siri, Airplane Mode, Roaming, Cellular data, Wifi, Bluetooth and Diagnostics & Usage is on Do Not Send (It used to be on Automatic) I don't have iCloud set up or Twitter and Facebook) All notifications are off in my notification list including the government alerts. I checked Cellular Usage and it says that I sent 153 KB of Cellular Network Data and Received 1.4 MB) Only things are on are iMessage and Send as SMS. I don't launch any games, iTunes, weather apps, or anything else. Are there any other apps that I need to turn off? Is there anything I'm missing? And is 588 MB usage a lot because I'm really nervous about the next bill?