Welcome to SCoA!
Feel free to drive it like you stole it. I drive my 2012 like it's a pickup truck, rally car, and racecar. 159k and still going strong!
What tire pressures were printed on the label will depend on if your car originally came with optional or standard wheels. Worst case, use the markings on the tires as a guide. I know some people run 30psi on all four and have no complaints. Personally, I run 35-40, but then again I have larger tires than stock.
If the insulation mat you're talking about is the carpet that you have to roll up to access the engine bay, I wouldn't worry about it. They all do that over time.