How many downs does an offense get to advance the ball 10 yards?

How many points is a successful two-point conversion worth? How many players does each team have on the field at one time in the NFL? How long is an NFL playing field between the goal lines? How deep is each end zone on an NFL field? How long is each quarter in an NFL game? How many timeouts does each NFL team get per half? How many yards is the penalty for a false start? How many yards is the penalty for holding by the offense?