You seem to have a lot of Ford specific questions so I'm posting this link as a recommendation. You'll be in the company of more knowledgeable, more fact less opinion type folks that are more relatable.
http://www.ford-trucks.com/forums/forum205/
For Bluetooth device look for ELM327 OBDII adapter on Amazon. The ones I use have a blue and orange label on them and have worked fine.
Coupled with that purchase from Google Play the app Forscan. It's easy to use and gives you access to all kinds of info. For details and parameters again I'll recommend the above link.
If you use Apple stuff then instead of Bluetooth adapter you'll need WiFi OBDII adapter.