Single Game Tickets and Where to Sit?

Hi all

I'm one of the few people from the UK who follow baseball. I can see season tickets on the official website but not single games. I'm looking at the Padres game, Saturday 20th April. Do single game tickets go up for sale at some point?

Plus where would you recommended sitting?

Another quick question, the tailgating area. I've never been to one and it's not a thing we do here. We just go to the pub before a game. Can I go without being in a vehicle? Can I buy beer there? Would I be welcome on my own?

Much appreciated for any help.