Hi Sheena,
Thanks for reaching out. I’d love to help you figure that out.
You can install Adobe Brushes (.abr files) stored on the iPad or the Creative cloud files storage. Check this quick video to learn more: https://www.youtube.com/watch?v=EGBfb9puU_Y
If you have access to Photoshop on a desktop, Legacy brushes can be accessed from Window > Brush > Brush Menu (3 horizontal lines) > Legacy Brushes.
Once you find the Brushes you wish to use on Photoshop iPad, you can create groups of Brushes > Export and bring them over to your iPad.
We hope this helps,
Thanks!
Sameer K