YouTube is a very good source for conversational examples. A recent favourite channel for me is "Easy German" - for instance, this video has a number of phrases that you'd commonly hear at a German supermarket. What I especially like about this series is that they have parallel subtitles (in German, and then English in a smaller font) and a lot of casual conversations.
Another option is podcasts. Radiolingua make a number of good Coffee Break language series, including German. I've not used the German one yet, but when I was learning French, I found that one very useful. I believe they offer transcripts of dialogues as well, but possibly only for paid members (it wasn't something that I was using at the time, since I was tending to use them while driving, so I simply subscribed with a podcast app).
A third option is a course like the "Teach Yourself", Assimil, or Pimsleur series. This post on Benny Lewis' Fluent in Three Months website is a good guide in choosing a course that matches your learning style and experience.
Finally, if you are looking for a bit more direct guidance, it may be worth finding a language teacher on a site like iTalki. They would then be able to take you through examples on a topic of your choosing. This can be especially useful if you are looking for a lot of feedback, if you're not sure about the material, or even if you are looking for material on a niche topic.