Best options may be through finding local groups that have meets, or find group chats centered around a shared interest of yours with other furs. Despite my social anxiety I got lucky with finding a good local group back in NC before I moved to the Bay, they took me in and brought me out of my shell. At that point I had mostly made online friends through discords and group chats.

As for the second part, just be casual about it and figure out what friends may be interested in being FWBs