I think best thing would be for you to ask ya parents. Diffrerent people have ways of celebrating it.

As far as i know, you will need a goat if you can find one or else chicken or a duck. A khukuri, cleaning kit including razors, rice, abir, flowers, fruits, etc.. rest u can google.

The whole idea of dashain is we r celebrating truimph of good over evil. So we basically praise our gods and make an illogical enactment by sacrificing some animals. Finally consume it, in the name of prasad.