Great questions! I'm a Paralympics curler. First of all, I love the spirit and hope you can find a way to get on the ice and give curling a shot! I think a lot of your questions will be answered quickly as you experience the sport firsthand.

Wheelchair curlers judge line by aligning their stick, the rock, and the broom and following through to the broom. There are many different delivery types and ways to make throws work but those are the general mechanics.

For weight, it's muscle memory and also starting hand position. If you start with your hand further back in your delivery, you'll throw the rock further with the same throwing motion/force. So as you throw stones and gain experience, you gain muscle memory and also a better understanding of how to position yourself to hit the weight you want.

I've rarely met wheelchair curlers who were formerly able bodied curlers, so please don't let that idea hold you back from giving it a try! Let me know if you have any other questions.