They should still be with their parents or their breeder!
It is very hard for someone untrained to raise birds, they will be needing hand feeding with formula every few hours, for weeks! You must be home to help them.
I am sorry, but you should never buy unweaned chicks, and especially not parrots so small as yours.
They are very cute though, but you really need to find a way to keep them alive as soon as possible. Can you turn them back to the breeder, or stay home and feed them yourself?
Anyone else with advice and more experience with young parrots, please help abang!
I am very worried for your parrots!