We sponsored a child in Vietnam with Plan. The reason I went in for it was partly to help, but also to learn about the situation, and mainly to establish a link between my own child and the sponsored one. As well as a small monthly donation, it was suggested that we send small presents once or twice a year, and the child wrote back and told us about his life.
To my shame, however, after a few years, we backed out. My son got fed up with the commitment involved, and so did I - we just found it difficult to make the time even for such a small thing as a letter and present twice a year.
I'm very ashamed, and it left me feeling guilty, so I wouldn't do it again. However, if you are prepared to keep it up, and/or you have a child who likes writing letters - and will continue to like it (as far as you can guess) - and is interested in people's lives in other countries, I would recommend it. We have kept our sponsored child's letters.
On the whole, though, I think I prefer to donate in other ways and allow the organisation to do what it feels is best with the money. One thing that I did wonder about was whether the child was actually allowed to keep the gifts we sent, and whether his friends were jealous of him - or, even worse - whether he was humiliated by being singled out for 'charity'. I know that if my son had been in his position, he would have hated it, and would have far preferred for the whole village to benefit from the donations.
I like the idea of donating football kit and boots to teams in developing countries, and also school books to schools and libraries. What would be a good idea imo would be to do is contact the Children's Village in Ghana (or anywhere, really), and get the school to raise money etc.