In line, with your toes pointing either at the target or just a bit to the closed side.
Don't focus on it and manipulate it that much. Just think about aggressively moving sideways toward the target. Let your body figure out the best way. Don't over-analyze.
It's a chain from the bottom up, transferring energy from one "link" to the next. The hips precede the shoulders by beginning to open up just prior to landing, while the shoulders stay closed until landing. At landing, the stretch created across the torso (loading) should immediately unload to cause the shoulders to rotate hard. The upper arm comes around with the shoulders (don't allow it to lag behind). The lower arm comes through last.
It's a chain (or wave) of energy transfer from the lower body, to the core, to the shoulders, arm then, finally, the ball. The momentum generated by the larger masses of the lower body causes higher speeds in the lighter, upper body parts IF it gets transferred well.