The leaves that drop are probably not the ones to use unless they are still plump. However, it doesn't hurt to give it a try. Are you sure your succulent is getting enough light? They need full sun and supplimental light in the winter. The soil should dry out between watering.
Thank you Evelyn
can I save the succulent in the attached picture.
Also so can you recommend a way to start the leaves and what to plant them in
Plant the leaves in succulent mix. It is available in bags at garden centers. Home Depot carries it as an example not a endorsement. I have had succulents do the same thing and I cut off the rosette and press it gently into soil in a pot with good drainage. I give the succulent about a fourth cup of water per week. Many of my attempts have survived and are doing well.
See link for a video about what to do. https://m.youtube.com/watch?v=OcAR-RdCTCo Searching for you tube videos about how to fix leggy succulents or etiolated succents will give you lots of different ones to watch.
You are welcome. Good luck. This may be the start of a new hobby,