i have tried to install new update on iphone 5 and now it wont turn on when i plug it in the charger it just shows i need to connect to itunes.

Connect it to your computer. Open iTunes and select the phone from the Devices section in iTunes' sidebar. Restore the phone.

Please get iPhone User Guide (For iOS 7 Software)Sep 20, 2013 - 23 MB.

Given the state your device is in you have already erased your old stuff. You have an image on the screen that says, "Connect to iTunes." That's what the image means. So you will need iTunes on your computer.

Upgrading iOS

1. How to update your iPhone, iPad, or iPod Touch

2. iPhone Support

3. iPod Touch Support

4. iPad Support

a. Updating Your iOS from iOS 5 or Later

Tap Settings > General > Software Update

If an update is available there will be an active Update button. If you are current,

then you will see a gray screen with a message saying your are up to date.

b. Resolving update problems

1. iOS - Unable to update or restore

2. iOS- Resolving update and restore alert messages

Don't blame the software. If you didn't want your stuff erased, then you should not have tried to restore it without finding out what would happen first.

Nothing should only be on your iPhone.

The iPhone is not a storage/backup device. It simply allows your computers or cloud services content to be portable. Everything should live on your computer or in your cloud service.