Greetings

Guten Morgen is good morning, Guten Tag is good day, Guten Abend is good evening, and Gute Nacht is good night. However you can always say Hallo which is less formal and you can use it just like you would use hello.

Herr is the word for Mr. Frau is the word for Mrs and also for wife. Whenever you see ...lein it is a diminutive and means little... So Fräulein (Miss) means little woman. If you have any doubt use Frau because Fräulein can be offensive.

After you have said hello you could always ask 'how are you?' by saying wie geht es Ihnen? and the answer could be gut danke.

Bis bald