Testing new tank

[Peteness]

hey every1 i currently have a 10 gallon fish tank in my room and planning to keep some clown fish.. (the orange ones)

i never look after an salt water aquarium b4 so im just wondering
what kit i need to test the water after i have finshi donig the nitrogen cycle (spelling)

also later on i would liek to breed them and wondering if the tank is big enuff to breed or i need a bigger one?