When hitting bunker shots you are not hitting the ball you are actually splashing the sand around the ball out of the bunker
When you begin your puttting practice start by dragging two footers into the cup without a backswing, this is going to make you concentrate on keeping the face square and give you the confidence of watching balls go into the hole
Think of your body as door hinges and your arms extended out as the door, when the door opens there is no roll in your arms, the toe of the club starts pointed up and goes back and through the same way, this is how your backswing should function