Here is a resource that provides a lot of detail on support brokerage (also called information and assistance):

 https://pb.appliedselfdirection.com/api/files/xdr1oqesscyfjmm/eblux47aylg2bl0/I&A%20Executive%20Roundtable%20Series%20White%20Paper.pdf

this is a resource for supported decisionmaking:

https://supporteddecisionmaking.org/

We also created this guide:

https://ncapps.acl.gov/docs/Resources/How%20to%20Expand%20Supported%20Decision-Making%20and%20Increase%20Informed%20Choices%20(1).pdf