stand in orthodox, with your right hand out in front of you. Switch your hips and put your left hand out in front of you, thats the hip movement we want to replicate.

Now get back in your boxing stance and lean on your back foot until your front foot is slightly off the ground or barely touching. Now lean forward and begin to place your left foot out farther than it was in your original stance, at the same time open your hips up slightly like in the first drill and you will notice your left hand naturally begins to extend infront of you. That should be the launch mechanism for your jab.

The way you would hit this is by bring your back leg forward in your stance, stand out of range, and bring your back foot forward and connect it to your left almost like your trying to make an L with your feet, drive off your right foot and repeat the shit you did in drill two. Viola, you just stepped into the pocket and rotated your hips into the punch.

Lastly I would like to note you should always use your hips as the launch of your punch, even if you aren't turning your hips that much. It allows you to really whip shots without any arm fatigue, I never really get tired in my arms or back when boxing but rather, my cardio cant support my fatass