A lot of material has been developed on how we can go about doing a lot of good. Here is some of the best.
If you like TED talks, watch Peter Singer’s The Why and How of Effective Altruism or check out any of the other TED talks and presentations on effective altruism. The Life You Can Save (Singer’s first book on Effective Altruism) in 3 minutes is also a great watch.
Ben Kuhn has compiled a great set of articles here.
A good primer on GiveWell, global poverty reduction (and charities in general): Giving 101: the basics
Peter McIntyre has written a post summarising charity selection heuristics, and some cause areas: Effective charities 101
Will MacAskill’s book, Doing Good Better, introducing effective altruism was published in August 2015.
Additionally, many individual writers and other sites have interesting material on effective altruism – you can find some great blogs on the EA Hub.