You should schedule the next day when the current day ends.
Planning each day in the week is not feasible because your tasks and priorities will change. You need to wait until the end of the workday to plan for tomorrow.
List all of the meetings, appointments, and relevant events in your plan. Note unfinished tasks for today to combine with new ones for tomorrow. Make a list of all tasks for the next day and prioritise them. Add the tasks from the list to your plan, according to their priorities.
If you take the time to plan at the end of the day, you will be able to save time the next morning and stay focused on your plan.