Wont start, just clicks.

check compression, check valve clearance, check injector for properly working, check for vacuum leak around this cylinder.

Check for a spark first, double check fuel pump is running and actually "hums" when you prime the motor. Check fuel filter, clogged fuel filter could be the culprit and explain why it sputterred with starter fluid but wont run without. Good luck.

I think you have an engine wiring harness issue going on here.

Obtain a Hayne's Repair Manual. They go over spark plug replacement.

If you have four cyl. have four injectors.

Yes,need to make sure crank is at TDC as well

SOMETIMES THEY LIKE TO PUT THEM ON THE FIREWALL ON THE DRIVERS' SIDE UNDER THE HOOD. IF IT IS NOT THERE THEN TRY UNDER THE DRIVER'S DOOR NEXT TO THE CHASSIS RAIL. HOPE THIS HELPS YOU. LET ME KNOW PLEASE. GOOD LUCK

take the battery out of the veh and see if it will charge overnight on a charger, if not then the bat just ran its course I doubt it is 11 years old. Bats last anywhere from 3 to 5 years then they die if it does charge then your alternator needs to be replaced as it charges the battery when you drive, low voltage may cause the buzzing, tellin gyou there is a problem.

The plugs that are supposed to be in a 2000 4 cyl Camry are :
PK20TR11 Toyota P/N 90919-01194

The K16TR11 plugs fit a variety of models.
They are found in the following units:

98/99 Corolla
95/97 Paseo
95/98 T-100 V-6
95-04 Tacoma V-6
00/04 Tundra V-6

There is no question that your dealer installed the wrong plugs.

I would really appreciate a FixYa rating for the information that I have provided you. Thnaks in advance.

solenoids are worn out, it will probably eventually start after 4 or 5 clicks but its annoying as hell