When I bought my Camry used it didn't come with a manual so now that I am about to change the spark plugs I don't have a clue as to what to set the gap to. Any help?

There should be a sticker with all necessary information for a tune-up under your hood on a sticker.

IF there isn't, you can get one from Toyota with your VIN number.

Answer is 0.043"

Killer,
Also, when you go to the auto parts store to buy your plugs, they'll ask you the make, model, year and engine size. Then they'll simply look it up on their computer and they'll tell you which plugs are available for your car and what the gap is. I've always been partial to NGK plugs myself but that's just a personal choice.