I think Deutsche Welle does iTunes radio streaming again (after having been down for goodness knows how long) so that's a decent place to start just to expose yourself to the phonemes of the language, and so you have an idea how it sounds. The only tip I can think of is to speak in the front of your mouth ('vorn im Mund!') like my Austrian German teacher told me to all the time, because English is spoken in the throat by comparison. Apparently it helps? Uh. Yes. And there are my learnings.