As someone who has a very high interest and desire of volunteering, especially internationally, I will give you and myself some advice by writing we should a book on the underground guide to international volunteering. It will give you some tips before you do it and even question if it is the right thing for you to do. Some people with great hearts may not be able to handle it and that is not an insult or make anyone less of a good person but more of a personal wiring.
It provides things like advice on choosing the right project for you to volunteer on as there are many. It also offers some tremendous interviews with people who have volunteered internationally sharing personal experiences, giving advice and offer inspiring words. Even practical things like information on travel insurance, how to pack, how to stay healthy and many other things! Basically if you have any thoughts or desire of internationally volunteering, be sure to pick this book up!