Learning Nazispeak

Hello.

Any advice on learning German? I'm going to Germany in october and stay for several months. Right now all the German I know is "guten tag/morgen", "ja/nein" and WWII movie vocabulary (sieg heil and the like).

Do you speak English?: "Sprechen Sie englisch?"
Thank you: "Danke" or "Danke schön"
You're Welcome: "Bitte schön"
Good-bye: "Auf Wiedersehen"
Please: "Bitte"
I love you: "Ich liebe dich."
I hate you: "Ich hasse dich."