Spark Plugs and Brake pads

[stargate823]

I'd like to change spark plugs on a new to me 2003 Boxster with almosst 70K on it. What would be a good recommended spark plug and what is the proper gap? Also, I have seen people talk about replacing the o rings and tubes. Is this something I should have on hand "just in case"? I don't want to strand myself if God forbid I need parts since this is my daily driver.

I also need new brake pads all the way around. Mine were just barely good enough to pass state safety inspection so I woul dlike to tackle them before the sensors need replacing. I would like some feedback on a pad that will put out as little dust as possible while maintaining street driveability. Can I assume that ceramic pads would be too aggressive for street use?

I appreciate any feedback!