When you find a film that appeals to you, but you don't know the filmmakers, you should have a good look at who they are, how they present the film, their take on the subject, and what motivates them to do the work.
Study the presentation of the film. It holds information about the project, budget level, the stage it is on, and financing in place. Producer, director and other creative team and cast are introduced; including links for verification, as well as film clips and trailers to give you the feel of the project.
Check out the links of verification of previous works offered on the film page, and search for further information from other sources, IMDB for instance.
If you go for a project, be supportive in all the ways you can. If all you've seen and read feels good and true, it is up to you to decide whether you trust the filmmakers to do their best on the film of your choice and whether to support them in the process.
Help promote the project by telling others. Share information about the films you are engaged in with your circle of family, friends, and colleagues. It is a great way to gather everyone around a common interest as well as empower filmmakers and widen the circle of audiences around your projects. And when you receive your link to First Run, help safeguard the film from piracy.