I cannot find the spark plugs on my camry !!!

First, you didn't mention which engine your 1994 Toyota Camry is equipped with. (This is really MUST-KNOW information if you want help with fixing your car.) There is a 3.0L V-6 engine and a 2.2L 4-Cylinder engine. Two TOTALLY different animals! I'll just take the extra time to answer for BOTH of them....

If your Camry is equipped with a 3.0L V-6 engine, You cannot find the spark plug wires because there are none, That engine is equipped with Coil On Plug (COP) ignition. The coils on the left bank (the side of the engine near the radiator) are located under the plastic cover on top of the engine. The coils for the right bank (the side of the engine near the firewall) are located under the upper intake plenum. The plenum MUST be removed to access them. (this is also required to replace the spark plugs.)

If you have the 2.2L 4-cylinder engine, the wires run down the center of the valve cover and the boots go down through the valve cover to the plugs. The other end of the wires attach to the distributor cap at the rear (drivers side) of the engine.