I would give him a very detailed list of every piece of equipment and livestock in the tank. That way he will know exactly what he's got and if he needs help, he'll know what to ask about. Tell him what the fish are eating and how to feed anything else in the tank that needs anything special.
I know you can't hold his hand the entire time, but does he know even the basics such as topping off with freshwater and how to do water changes? Does he know where to get good freshwater an salt?
Definitely tell him if he wants things to be easier starting out, he should come on here and do some reading.