Car was running,check engine light is on was told about that that the transmission is slipping but now my engine is locked up or seized what can I do

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First I changed power steering pump,then tension pulley and belt, starter,fuel pressure reg.,one spark plug wire cause it broke didn't replace plugs or other wires then car stalled a few times trying to start it but started it never stopped on me while running,turned car off once and it wouldn't start back up was told that the engine was lock up or seized tried turning the engine manually but it wouldn't turn clockwise but counter clockwise what can be done to start car or do I need a new engine