Dear Joe,  

To learn more about the priesthood you can read Pope John Paul's story of his own vocation and his personal reflections on the priesthood in his book, 'Gift and Mystery'. See if you can get a hold of Fulton J Sheen's book (sometimes hard to find) called, 'Those mysterious priests'. Any well-done 'life of Christ' (again I recommend the one written by Fulton J. Sheen) will help you understand the call to the priesthood.  

To know if you have a calling to become a priest or brother you have to look into it. Get advice from a good priest you know. It is a very good sign that you are even asking yourself the question, but you need the help of someone who knows you to be able to tell. Or visit a seminary or order that interests you, they will be able to help you