Where can I find a legitimate list of the saints and what/who the protect?

After watching the movie Charlie St. Cloud and how the EMT/Paramedic gave Charlie the saint that protects him... I'm going to school to be an EMT and Im considering getting a tattoo that coincides with St. Michael because he protects police officers and my dad has been a police officer for 25 years and my sister will be joining an academy soon and I want to get it on my shoulder/shoulder blade.... please help!! i need to find a legetitmate list!!