Selling it on your website as in selling copies? but you still own all the rights to it correct? Festivals are a great oppertunity to possibly get your movie bought, or perhaps bring it to another level. There is also a big to-do when it comes to licenses pertaining to music. Sometimes you can get deals when it comes to strickly festivals but the second it goes out for distro. you have to go back and pay more money. Now lets say your film does good and a company wants to pick it up, most of the time they will pay your costs. That just has to do with music so i thought i would throw it out there. I would say depending on how many festivals your planning on going to would be your answer. If you are planning on a lot of festivals I would hold off but if its just 1 or 2 perhaps I would go ahead and start selling.