There is a misconception about who works and who does not with a TFP shoot. I am amazed at how many people get offended when someone who has posted about a TFP shoot will not work with someone else. Again a TFP has to be beneficial to both parties. Not just one. If you are a model or a photographer, this can be to your benefit or not. You need to make sure that you are one wither getting the education that you need to perfect your craft. Or to get the images that you can use to help your portfolio attract more clients.
The issue I hear about most is that the number of images and hours into the shoot are not communicated very well. If you are not going to have this in writing beforehand, there really is no reason for you to go into a shoot with false expectations. The also misconception is whether you would be getting raw or edited images. Make sure this is also out in writing. Manipulation to images after they are edited is a huge rule that this not easily forgiven.