contact an organization nearby your area where you live that is already doing this, i.e. helping orphans. Often they look for volunteers to help them. In this way you can make your contribution and get like-minded friends.
In case you wish to also contribute with some funds I would suggest to do it only to those you trust and you are sure they do the right job and (especially) do it honestly and transparently.
That is my suggestion. If you do it alone it might overwhelmed you.