And hello to you too, yes there are a lot of options out there, but since you're here for advice, I can personally recommend reading about how to make Demi-glace sauce here
https://sauce-wiki.com/demi-glace/ . The material provides a step-by-step plan, so I'm a hundred percent sure that you will certainly not have any questions after reading it. I hope that I was able to help in this matter. Good luck with familiarization and preparation!
