Not quite as seasoned a camper as you but starting the same journey next week with my three year old.
Will prob start out in the back garden the first time, if that goes ok will progress to the Campsies for a night, then start thinking about further afield…
Prob going to just use an inflatable double mattress for us both or poss just for him! Got him a decent sleeping bag. Bedtime-wise not sure, thinking about keeping the normal bedtime routine but not sure if it will be possible due to excitement! Him, not me.
Anyways, looking forward to it, hope its enjoyable for all concerned!