brake help

here come the embarrasing ?'s I have power brakes, disc front, drum rear. The dual master cylinder, are both resevoirs to be filled? Only the little one was full. There was a cut in the line at the pass side hose, fluid on the floor. I replaced the line and filled both resevoirs. The pedal goes straight to the floor with almost no resistance. Do i need to bleed the brakes? Can i do this alone?
thanks in advance.