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Solve them one at a time. Have you used a simple scanner or had the car on SDS? SDS will read much more than the standard OBD-II codes, including diagnosis of ABS components.
As for fuel trim, read the adaptation values to see if you are running rich or lean. Then it's a good bet that you're either needing an Air Mass Meter or Fuel Pressure Regulator. Reading the adaptation values will point you on the path initally.
ABS lights can be triggered by a malfunction in the ABS sytem, but also by other things, including low voltage. Solving the drivability problem is the first task, and then dig into the ABS if the problem remains.
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