Please need profesional advice here! Problem with Check Engine light! ;(

It dont have the bulb!!!!! So, I will buy one. But I took anoter bulb and put it there and make some tests. After reading codes it gave me these:

Code 23
Knock Sensor Circuit Malfunction It can be fix with these:
-Open or short in Knock Sensor (KS) circuit
-Knock Sensor (KS)
-ECM

Code 1
Primary Heated Oxygen Circuit
High/Low Signal
-Open or short in Primary HO2S sensor
-Primary HO2S sensor
-ECM

Code 43
Fuel Supply System

To much errors hhhmmm?? What can I fix , I dont know much about engines. =O(