Hi @Nina !
Advanced and Qualified signatures (AES and QES) can be considered paid feature, in which case you will need to purchase an "add-on".
My suggestion for you is contact the Docusign Sales Team, where they’ll be able to understand your needs and suggest the best plan for you. Among the questions, they will understand how many users will use it, what is the expected volume, how many use cases you will use, and other questions!
To contact them, simply access this website: https://www.docusign.com/contact-sales
Let me know if you have any questions!