Once the cycle finishes, i usually throw in the inverts ( snails / shrimp / hermits ), as these will the start off your cleanup crew..Then, its up to you whether you start with fish in next or coral....Some prefer to wait a while before they start to add coral, to allow time for the tank to settle down after going through the cycle..which is all cool...
** As a side note ** When adding fish, its always best to go from placid to agressive / territorial. If the aggressive or territorial fish go in first, they will have a tendancy to consume everywhere as their territory, and any future placid / peacefull inhabitants will then have a struggle to establish their own..