>>/24433/
You were the one asking about Rosetta Stone. I tried it once to learn Italian, or rather to continue learn it since many years before I did some. I think in itself isn't enough. It makes you familiar with the language, but don't expect to be able to hold a conversation.
But you might start with that. But get a proper book, learn grammar and and build a vocabulary. For German you really need to sit down and drill those words, Anki can help, or better make an effort and create the flashcards yourself.
The best would be a teacher who explains stuff, forces you to speak out loud, helps in exercises and issues homeworks and demands to really make them.
It won't work if you do it half-assed.