welcome to the world of CPen. It is the most unique and challenging style nowadays, and even professional players fail in adopting it. I would recommand to watch Wang Hao's instructional video at:
Watch it again and agan untill you fully understand how to use reverse backhand. Two of the most important mistakes I found in many peoples are:
1. Hold the racket correctly. It it very very important because otherwise you will have bad habits and stop imporving at some point. Watch the video carefully and try to find the most comfortable way of holding it with your own hand.
2. Give up using traditional backhand to block. Traditional backhand and reverse backhand are not compatible and your progress will be hindered if you use both.
Have fun and be proud of being different from other players!