How many spark plugs do I need to order for my 2002 Toyota Corolla? Which kind should I get?

I'm not going to replace them myself,, since I'm not that knowledgeable yet but I'm going to give them to my mechanic to install. I just can't find how many I need to order. Also, is the CHAMPION 33182 {#3318} "Platinum Power" Gap .043 a good one to buy?