I saw a great suggestion to help children visualize their social distance spacing: place each chair in a hula hoop (or have the children sit on the floor and stay inside his or her hula hoop's circle). Another suggestion is to mark a grid on the floor with tape (like a parking lot, with "aisles" between rows of personal spaces).
And for classes that require supplies, get a colorful cheap beach bucket for each child at the dollar store to hold pencils, papers, scissors, gluesticks, etc. Each child has a bucket waiting inside his or her space. No need to pass out supplies during class (some children may need to be reminded not to peek, or if all of the supplies are needed later in the class time, pass out the buckets when needed --- after washing your hands again.) No need to mark names on buckets - the nonconsumable supplies can be cleaned before the next week. Although I believe most people agree that the virus does not live on surfaces for very long, so if each bucket is only used once a week, you might not really need to clean them or the supplies inside them before the next Sunday.