"Take Key" buzzer goes off when door is open. Car won't start. Yellow /\

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Key was lost. Steering lock was removed so car could be moved. Ignition in position 2, SRS light goes out for 3 seconds, comes back on. Engine turns but won't start. Key sensor (plastic ring at end of ignition in dash) was unplugged. Key I purchased from Dealership. Works door locks, ignition & alarm system is functional. I don't know where to start. I was injured last year & am on disability so funding for this project is limited. HHHEEEELLLPPPPP