Google Jamboard works fine, which has been my major online whiteboard app for years.
students can pull up your whiteboard and interact with it if you let them. Simplifies things bc you don't have to share screens with them, and if you have students in class and virtual at the same time, you just draw on your screen at school and it shows up everywhere without screen sharing.
I got a xp-pen drawing tablet . I think and I love it. Way better than a mouse, since I can write on the Google Jamboard app. You can draw or write with a mouse, but a tablet is much easier and more natural feeling.