well, I did pay to do several sessions to build up my port. Once there are couple of decent shots, you could do three things:
1) do a search of the local model who is willing to do TFP. send them a friend request and start to build relationship.
2) set up a casting call and tell the world what you are willing to do for TFP
3) answer someone else's casting calls.
Make sure you develop a model release. I copy one from web.
There are soooooooooooooooo many girls who want to be a model and they are willing to do just about anything to get high quality prints. Once we had a shot and it was 30 F. At least 10 girls came with Bikini because they want good shots.