Thinking of starting a charity organization. need advice.?

I'm a retired Master technician and would like to do some charity work for people who are down on their luck who need their cars repaired. (i.e. single parents, welfare, etc.) but, i would need them to prove to me that they are in need of financial aid without invading their privacy. how would I do that? then I would need to get some sort of license for doing this, I'm sure. Any input would be appreciated.