go into settings on your phone: settings>general>(scroll down) iTunes Wi-Fi Sync. it will tell you the names of the computers you have synced with. then you tap on the computer you want to connect with wi-fi to it should have an option to sync with copmuter over wi-fi. press that and your phone should appear on your itunes wirelessly
You can't as Apple has stopped signing the iOS 5.1.1 firmware file. You also won't be able to restore from the backup as the backup files won't be compatible.
You can go to https://iforgot.apple.com/appleid and you ll have to go through all that authenication and once you get the passwords straigtened out then you can turn off find my iphone. Once that was completed then you can just delete your icloud account.
You can't update to iOS 7.0 or any older iOS software updates as Apple has stopped signing the firmware files. You can restore to latest software update only, which is iOS 7.1.1.
If you have iOS 7.1.1 the only JB working on it is ---> THIS ONE but it works for iPhone 4 ONLY !!!!! There is no JB for iOS 7.1.1 iPhone 4S, 5, 5C or 5S !!!!!