Question: Is it useful to have the main character have a premonition or dream/ flashforward with little detail of whats to come?Answer:
All techniques can be useful depending on the context and the effect you are trying to create. I assume in this case you're after a little suspense or to propel your character to start looking at an issue/possibility they haven't before? Of course, premonitions usually belong in stories about the supernatural, so you have to think about what genre you're writing in.
If you're not sure, try writing two versions of the story, one with the premonition and one without. See which one is more emotionally compelling and go with that one.