It's great to hear you are looking to install your brushes into Illustrator! We have a tutorial below from our Learning Hub which should help you work with your brushes in no time:
We also have a guide with written instructions which may also help:
Basic Guide: How to Install and Use Photoshop and Illustrator Brushes - https://bit.ly/3qhGbH7
If you need any help with your brushes, please do contact our Customer Support Team, and we certainly would love to help!