ok so im 15 and im planning to buy an iphone 4s(my first ever apple product) but seeing how my parents wont let me get the Iphone 4s on pay monthly ill have to get it on pay as you go so i want an iphone 4s in a white Colour but my parents are going to get it for me on my birthday which is in june....(long!) the price now for a iphone 4s 16 GB is £499 and an iphone 4S 8GB is currently £400...
i know the price will reduce until june but i want to know if i buy the iphone 4s 8GB how much songs,pictures wil i be able to put in it roughly and what with the 16GB how much pics and music will i be able to have.
also should i wait for the iphone 5?? but my parents wont be willing to pay something that's over £450....
i know i have to like buy itunes gift cards for purchasing music from the itunes but what is the apple app card for?
cant i buy apps from the itunes gift card? also can i buy music and apps from my iphone 4s through itunes?
any other information will do thank You!

WHAT THINGS SHOULd I GET WITH MY IPHONE 4S? like accesories? any useful things?