You can check out the Sharks Powerplay Ticket Trader for single tickets and they'll get sent to you, I think you can only do this up until an hour before the game if you want it by e-mail. I'm honestly not sure if they do ticket office pickups or whatever but I'm sure all the information is there.
As far as parking goes, there's a bunch of places all around the rink for $20, there's plenty of signs around, I prefer parking off the Julian St. exit. You can park farther downtown to go cheaper or if you feel like walking, the Adobe building has garage parking for like $5. There's a pretty good HP Pavilion parking map here.