The iTunes app card is only for Apps for the iPhone or iPod Touch.Read more: What_is_the_difference_between_an_iTunes_card_and_an_iTunes_apps_card
you don't need an itunes card (you can use one but you don't have to), bit you do have to have an itunes account and a credit card
Im almost positive you can get apps too
Yes
You can purchase games with an apps card and an iTunes card. There is no difference between the two.
Go to the app store and use you iTunes card to get apps
Yes you can, a itunes gift card can buy anything on itunes.
Yes, you can use iTunes Gift Card money.
In the iTunes or App Store apps there is a Redeem button at the bottom of the page which is used to add an iTunes gift card.
sure
Yes, if you go to the apple store or itunes app on your ipad, theres a redeem button on the bottom somewhere and then you put the code that the itunes card have.
Yes,you can go onto your account settings for iTunes and then click Edit payment information. You can enter an iTunes card as long as you have the code on the back that's only when you start creating an account when you already have an account you go to itunes and go to redeem and type in your itunes gift card code