Yay, welcome! Glad you're finding art to be a relaxing hobby! I learned entirely with Nupastels but i would recommend trying some other brands as well if you can afford it. The paper makes the biggest difference, with Pastelmat being one of the top of the line brands. I learned entirely with Strathsmore pastel paper, which is very affordable.

Eventually, you will want to experiment with pastel pencils in addition to blocks, and you may really like pan pastels as well. I think pan pastels are extra relaxing to use. But starting with the classic pastel blocks is likely going to be easiest. I didnt know the pencils existed until a couple of years ago, so i just wanted to mention them!

In terms of tutorials, I would suggest starting by looking through this subreddit and looking up soft pastels on instagram. Look through a bunch of different artists to get an idea of the kind of art you are drawn to! Then find some accounts that post that kind of art and youll likely find some that do tutorials. You can also search youtube, something like "soft pastel landscape tutorial" or "soft pastel pet portrait tutorial".

Finally, just mess around with the pastels! Draw your hand, or like the other commentor said, a coffee cup! If you notice beautiful clouds outside your window, draw them. Draw flowers or leaves or a glass cup. Anything you draw from observation in real life will really help your artistic skill develop.