WFG you might like to consider the proportion of time a child spends on each subject at school as a starting point eg 5 English and Maths lessons but two Physics, IT etc or you may want to move completely away from this?!
This will be based on 'core' subjects which are disproportionately weighted in English schools, with Maths, English and science squeezing others out. If I were home educating again, I would ensure I did exactly the opposite. In fact, why timetable it at all? Use the time creatively ...you could do a whole week of Art for example, visiting galleries and trying different media; and have a Chemistry week of blowing things up and mixing and fizzing; a Sport week based on the forthcoming event, which would lead into geography and history....surely the best thing about leaving school behind is to leave the constraints behind too?