Some additional equipment you many need
Heater and thermometer
Live rock ~ 1-2 lbs per gallon
Pair of buckets and a siphon tube
possibly a QT set up
I may be forgetting some things but those are the ones off of the top of my head. Most of it isn't that expensive. The live rock can add up fast though. It is usually in the ball park of around 5-6$ per pound. A cheaper solution that takes longer to cycle is to get dry base rock.
As far as keeping corals and fish thats a complicated question. The live rock will provide most of your filtration and you will be fine with fish. As for corals that depends on what kind of corals you want to keep. Soft corals mushrooms and LPS
corals will probably be ok with the lighting in some of them. If you want to keep SPS
corals they are generally high light corals and you will be required to upgrade to the MH
hoods that some nano cube companies offer. I strongly suggest doing a bunch of research and figuring out what kind of corals you would like to take on and then figure out what tank lights to buy from there. You will have to do frequent water changes (1 every week or two) in order to keep your water conditions up to the quality that keeps corals happy. Most fish are a bit more forgiving. Lots of water changes are the curse of nanos.