Set clear and specific objectives (.pdf) for team members. When people work flexibly their performance may be less observable. Trust becomes more important than control.
You will need to be clear with your team how you will assess their performance, and you will need to focus on desired results and outcomes as your main measure for performance. Give them deadlines so that they can have a thorough understanding of which objectives need to be completed first. This will help them to prioritise their day.
Provide regular feedback via regular check ins and development conversations. Mentoring conversations will encourage individuals to reflect on personal development, strengths and opportunities. Encourage your team to reflect on there own practice. You may wish to use the guide to reflective practice (.pdf).
Be careful not to tell them exactly how to achieve the goal, they will still need flexibility to work in a way that is most effective for them. Provided that they understand the required result along with the deadline and any other important factors, you can empower them to be effective and maintain morale.