If I ever became rich, I could use my money to help people that were in desperate need of help. (I can't translate '做善事' and '助養兒童', because they're basically the same thing D=)
If I ever became a rich person, I could retire at an earlier age and spend the rest of my life living happily with my family, in order to repay them for what they have done for me.
If I have been the rich man, I may use my money to help to have the need person, makes the good, helps raises the child and so on, if I have been the rich man, I may shift to an earlier time retire, lives happy with mine family member, repays them to raise graciousness