(For a right hander) Start with your left (slide) shoe about the middle of the lane (the big Dot at the 20th board is the center of the approach and lane, side to side).
If you can, position the ball in front of your armpit with the thumb at 10 o'clock (as a right hander, 2 o'clock for a lefty). Try to swing the ball, straight back and straight forward (let momentum and gravity do most of the work). Try to maintain the hand position throughout the approach, swing, and delivery.
As the ball rolls out of your hand, continue the hand forward (toward your target)and up, like throwing an imaginary glass of water up and over your bowling shoulder.
Maintaining the hand position will provide the axis tilt you want. Keep your first step short and measured, you want to stay balanced, starting slowly. The faster you go the easier it is to get out of balance, or mess up your timing, or both, bad idea.
Also, try to use your back and shoulders to provide leverage at delivery. With some knee bend, you should be in an "athletic pose." The knee bend maintained as you move to the foul line will enable you to absorb some of the wobble of your approach (benefits your balance), and provides stability, to deliver the shot with consistent speed and rotation. Consistency is your first objective.
Adjust footwork (starting point of your slide foot) right if you miss right, left if you miss left.