Financial questions that need an answer

when i place in my address for the billing adress seciton it says its invalif. how do i make me addres be added to it,, or how can i make this work on paypal?
and it it wont.. do u know any other way i can send money to people using somehting like paypal.. i need to pay someone in england but obviously i dont have 30 sterling punds or whatever so i need to pay them 60 USD and in the payment convert it to pounds for people in the UK?? please help?!
i can make a money order to send to people in england using my us dollars for brittains pounds??

and also, do u have to be 18 to get a money order??