You can start with defining a 'good deed'.What are good deeds?
Then, maybe show that the world nowadays is lacking compassionate good samaritans who are fundamental to bring some sunshine to this cruel and no-nonsense world. Lol what am I blabbing about ?? anyway, go on talking about what you can do as a person to be one who carries out good deeds. Also, state examples of good deeds like having a fundraiser for the less fortunate and so on.......Good luck