Appe id? Credit card info? What info should i put?

I just brought a iphone and its the first time i buy an iphone. While i'm doing my apple id they wanted my credit card info so i can buy apps and i don't know what info should i put? Should i put the 16 numbers that are on the front and my credit card password or i should put the numbers on the back of my credit card (7 number)? What info should i put i don't want to get robbed? And when i buy an app what info should i put?

You don't need to put a credit card, go onto top charts and press install on a free app, then it will say create new or use existing and create new apple id and you won't need a credit card!

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