Depends on your password strength, if you feel like someone knows your password then simply change it but make it more complex next time.
Apple has now made it that your Apple ID must contain
1. Numbers
2. Upper score letters
3. Case sensitive letters
Apple did this to protect their customers from fraud and hacking
No. You need an Apple App Card to purchase Apps from the App Store!
No, you can just use your own credit card.
Go to the app store and use you iTunes card to get apps
No, you can not.
You can use an iTunes card for purchasing apps at the app store. Maybe your card still has a value of $40 because you downloaded a free app.
At the store
You will have to input your credit card details to spend money on iTunes and the app store. You cannot actually "add" money without a gift card but imputing your card details in your account will be charged for each purchase you make.
NO
No, you will not be charged.
Discover does have a credit card app. This app can be downloaded from the Apple App Store or the Android Market. With this app, a person can view their statement, their account summary, or their available credit.
Yes, you can purchase gems for DragonVale using an app store card, as it allows you to add funds to your app store account. Once the funds are available, you can use them to buy gems directly through the game. Just ensure you have enough balance in your app store account for the desired gem purchase.
Nope too bad