Start problem

Hello municipality, I drive a Corolla E11 Baujar 2000. Since this morning the engine no longer starts. The battery is not empty, because all consumers still work. I only get a very quick click when the key is turned into the starting position, and the valves (tacho and tachometer) play crazy as if they would get too much power. The whole thing started about a month ago, when the moter started cold quite badly, only on the 2nd or 3rd day. turn the key. After reading various posts that first point to the spark plugs, I wanted to look at the candle picture. But unfortunately I can’t find the spark plugs. I suppose they are under some cover. Can someone tell me how to get to the spark plugs? What else can it be besides the candles? How can I recognize if the starter is defective? Many greetings!