Hi Allysa!
Miranda Castro writes very good self-help books. She doesn't insult your intelligence and addresses some of the questions you have asked.
Of course there are lots of other self-help books which are also brilliant but that's the one I turn to time and time again!
Personally I would suggest you stick to the lower potencies (6c) if prescribing for yourself for the family, or until you can find a qualified practioner.
The book on-line that Divina suggested is great and there's lots more you can learn online in particular here at this site.
Good luck
Deb