People work differently and projects work best when people agree on a working style. This is especially true when collaboration is paramount. Make sure that the freelancer you hire shares your expectations about working remotely and believes in your choice of communication whether the choice is email, text, Skype chat, Google Hangouts or phone calls.

Another part of this question can involve discussing the various tools that will need to be used on the project. If you use Todoist for project to-do lists, but your freelancer uses Evernote then you will need to come to an agreement on which platform to use if your project involves shared lists. If your project requires extensive use of Hootsuite or Omnifocus, then you will most likely want a freelancer who has extensive experience using those apps or platforms