<p style="text-align: center;">Hi, I'm new. My brother is trans and looking for a friend network in Los Angeles. Any suggestions?</p>
Welcome to the site. I hope it will be useful for you.
To answer you question, I would start by doing a search:
transgender resources los angeles
Some of the results are:
http://www.publichealth.lacounty.gov/dhsp/Transgender.htm
Anyway, do some searching around. Lots of resources in the Los Angeles area...