Here is a post by Gosia Kwiatkowska which maps out several self-study plans for English learners over the summer. What I particularly like about it is that she recommends focusing just on learning objective (e.g. systems, skills, exam prep) and has a checklist of questions to take you through the whole process. One of the most important questions: how do you want to check in on their work? Gosia even adds an example of a Google hyperdoc she prepared for one of her students: good stuff!