By November there should be a practice schedule listed on the Preds site. The practices held at Centennial Sportsplex are open to the public. You can get player autographs there as they are coming off the ice after practice. Any practice at Bridgestone is closed to the public.
With our recent success we seem to have a bit more autograph seekers. If you don't care about seeing practice itself, I would just hang out by where the players go on/off the ice to get a good spot to catch the players you want after practice.
Most all of the players will stop and sign stuff or take pictures.
The parking lot at Centennial is behind the rink, but it's fenced in by a locked gate. If you wait out there, sometimes a few guys might come over to the fence and sign something. It probably should be small enough to fit through the fence links.
Outside of having tickets to the Lexus Lounge, I'm not sure of way to get autographs on a gameday at Bridgestone anymore.