Use live rock and live sand if you wanna jump start the cycle.
For cuc do a few snails and a couple hermits, maybe a shrimp if your fish permit you.
Livestock is go with a pair of black/ white clowns or if you have the money some of the designer clowns ( look up it's farms clownfish they are gorgeous) if you don't like clowns look on live aquaria for nano fish. You could do a purple firefish and clown goby?
Also if you want corals make sure to use reef salt and have adequate lighting. Don't rush anything!