Typically, when planning instructional activities, you should start at the unit level because you want to consider all the support and practice students will need around a particular concept and its associated learning outcome. Each activity in the unit serves its own purpose in helping students achieve the learning outcome. For example, some activities might serve to provide information on theories, definitions, processes, etc. while other activities focus on the practice and application of these. Together, this collection of learning activities gives students what they need to understand, practice and apply the related content.
Once you have identified the supporting learning outcomes for your course, you are ready to use these as units of study to begin the instructional planning process.