You'll want to pick up some pure coconut oil. Just checked out the blue magic and it has petrolatum in it, which isn't water soluble, so I personally wouldn't put it on my scalp. Shampoo might get rid of it, but pure oil will wash out easier.
I think you could do this weekly or biweekly.
I have rather porous hair that sucks up oil and moisture, so it does not get oily. I can get away with just cowashing. If you tend to get oily scalp, have fine hair, or just want a clean feeling I would no-poo. Brushing your hair while wet also distributes the oil from your scalp. You will probably have to experiment a little. I hope it helps!