How to... - bardzo proszę o sprawdzenie

A: Hey! What are you doing?
B: I want buy Pepsi from drinks machine, but I don't know how.
A: Thats very simple.
B: So could you tell me how do that?
A:Ok. First you have to put some money to coin slot.
B: Ok. Then what?
A: Then you have to choose drink and push the button with name drink that you choose. If you throw too much money, the machine give you change.
B: All right. I do that.
A: Thats all. Now you must only take your drink.
B: Is that all? I thought it'd be more difficult than that.

Będę bardzo wdzięczna za sprawdzenie tego krótkiego dialogu. Wydaje mi się, że nie powinno być wielu błędów...
Z góry dziękuj!

B: I want TO buy A Pepsi from THE drinks machine, but I don't know how.
A: That's very simple.
B: So could you tell me how TO do that?
A:Ok. First you have to put some money INto THE coin slot.
A: Then you have to choose THE/YOUR drink and push the button with THE name OF THE drink that you choose. If you 'throw' (lepsze slowo to 'INSERT') too much money, the machine WILL give you change.
B: All right. I'LL do that.
A: That's all. Now you must 'only' (niepotr) take your drink.

Dzięki za pomoc!