In your owner's manual there is a maintenance schedule guide, if you no longer have this it can be ordered from any Toyota dealer (it is inexpensive). The frequency at which your car needs service and maintenance really depends on under how you use your car, climatic conditions, type of trips you take ect... This is explained in the service manual as normal or severe service conditions I am still an advocate of changing the engine oil every 3,000 miles and back this up by the fact that I have two vehicles with over with 160, 000 miles on each neither burn a drop of oil and run flawlessly. Many of my customers have 200K and 300K miles on their vehicles. Your Camry has a timing chain so with regular engine oil changes the timing chain is maintenance free (you are spared the expense of replacing a timing belt as was the case with previous Camry engines). Newer Toyota automatic transmissions use a high quality oil that under normal conditions is recommended by Toyota to be changed at 100,000 miles (but I would feel more comfortable changing it at 60,000 miles), Toyota recommend changing the air filter every every 30,000 miles (every 15,000 may be advisable for engine longevity), Spark plugs are not due for a change until over 100,000 miles but worn spark plugs put stress on the ignition system and again being conservative and in the interest of achieving engine longevity and reliability I recommend spark plugs at 60,000 miles, checking valve clearances at 90,000 they and changing the fuel filter at 60,000 miles. I am a huge fan of Toyota products, with care these cars can be kept reliable for many miles.