Especially in a distant context, the way you communicate is the key to everything. In fact, it's the case when over-communicating won't be a problem, as you don't get to talk face-to-face. Seeing facial expressions of your workers is a powerful factor when you want to know what your workers have on their minds, so try to compensate for the lack of their presence with a help of video-chat tools like Skype or Slack.
According to studies, verbal communication is only 7% of how you are perceived (38% is para-verbal and 55% stands for non-verbal), so make sure that the lack of facial clues is counteracted by regular check-in meetings. Having at least one face-to-face meeting during the project is arguably the best way to set up a sense of mutual respect and feeling that both parties are here for the product's success. Remember that the lack of contact is a major contributor to the "deal with these issues later on" attitude from distant workers, especially if the info exchange was unclear, therefore, don't mind to remind them the actual requirements.