I spent 25 years teaching math and science from 5th grade through high school. I taught many cross-disciplinary classes as well, so I'm comfortable teaching writing and something about most subject areas. But my first priority with my kid (9yo) at this time is how he's feeling each day. When our kids grow up and look back on this time, the first thing they're going to remember is how they felt during this time. Did they feel safe? Loved? Listened to? Those things are going to be seared into their minds much more than whether they got stronger at math or reading or any other academic area.
So each day when my kid asks, "What are we doing for school today?" the first thing I say is, "How are you this morning? What have you been thinking about?" Some days we end up jumping right into learning activities. But some days we spend most of the time just talking, and answering his questions. And to be perfectly honest, some days we just cry together for a little while.
All that said, this is probably the only time in life where we'll be homeschooling. So rather than focusing on information and individual assignments that the school is providing, I'm focusing on critical thinking habits, and other ways of understanding that should set him up to enjoy school and do well. We're doing longer writing activities - watch an episode of your favorite show, then write a summary of what you watched. How did the story begin? What was the source of tension in the episode? How was the tension resolved? Were there any interesting subplots? That allowed us to develop a writing process, with a focus on revision and conversations about knowing your audience and defining a level of quality to aim for. With math, I got him a beam compass for Christmas, so we took that out and learned to use it. Then he measured diameters and circumferences, divided c by d, and discovered pi. Fun constructivist activities like that will do a lot more for his long term relationship with math than a bunch of drill activities will.