sundialsvc4 is right - as a general rule, if your movie is available to watch for free online - or available to watch in its entirety at ALL online, why would someone pay to watch it in a festival? Save the airfare, hotel room, passes to the fest, and fire up your web browser!
Also, if you are hoping for someone to distribute your movie, you can’t either show it online, or sell ONE COPY anywhere - once it’s sold to people (say, for the sake of argument, you sold DVDs through your website), it’s “out there” and there’s no telling how many copies have been made. Which means their markets may already have copies - and why would they pay to get it from a distributor when they’ve either already got it, or can make copies on their own - get it?
If your goal is to show it and sell it yourself, do whatever you want. Fests would like it to be on the fest circuit first only, THEN you can do whatever you want. Distributors want to be the ONLY one who sells it.
While there are always exceptions that disprove the rule, stick with the general rules and you’ll cover your butt. Better safe than sorry.
Sounds like you only want to put up trailers on your site since you plan on going the fest route. Make a small handful of trailers and release them gradually - maybe 1 a month or so. Just don’t show too much - entice, don’t reveal.
Hope this helps-