Posture:
Stand tall to the ball...bend forward from the hips while holding the club with your grip as if you were addressing the ball, flexing your knees slightly...raise the club vertically and place the shaft on your right shoulder with the head of the club resting near your right ear...now relax your arms and let the head of the club fall forward like you were chopping wood, keeping your arms totally loose and just allowing the head to fall...
Where the head falls is the bottom of your swing...put the ball there...
As for the grip, ten years later I still am working on mine

A book that will give you a pretty good understanding is the Ben Hogan 5 lessons book...just keep in mind that he was fighting a hook his entire golf career and the neutral grip that he reccomends combined with the cupping of the wrist at the top and the fact that his clubs were bent 5* open helped him to play his trademarked fade...it is a starting point anyway, and you can strengthen or weaken your grip after you have absorbed the fundamentals covered in the book...