My entire first year natural I was the box braid queen. I miss them, will be getting more soon.
I kept a moisturizing leave in spray to keep them moisturized. Braid sprays worked okay, but Aussie Moist Hair Insurance Leave In works great and is cheap. Your hair will be so soft. I would moisturize them every other day.
I'd wash them using an applicator bottle and diluted shampoo (half water and half shampoo). I would also oil my scalp three times a week and tie them up when I slept.
Hope this helps!