Hi! My boyfriend and I have recently decided that I could start looking for a girlfriend of my own. Apparently its harder to find than we thought, so just looking for like-minded people, resources, whatever.
Some of those are dating sites, others are listings of local poly groups. You can also google "polyamory" with the name of your state or city.
Besides all that, spend some time looking around on the threads on this site. There is a lot of valuable info here; it will help you prepare for finding someone.