so many questions (spoilers)

There was so much unexplained. What was the history with the other bikers? Was he an avenging angel or something? Who was the man who gave him the shot gun? What happened to the hotel woman? What was his connection to JJ? If he was father to those children why wasn't he there unless it was because he was dead? All I knew by the end of the film is that he liked tequila with no lime or salt and liked to read his bible.