Switch Mode Power Supply Repair How To Design A Switch Mode Power Supply (SMPS) Circuit With Dual Output Voltages?

How to design a switch mode power supply (SMPS) circuit with dual output voltages? - switch mode power supply repair

I want a Circuit Switch Mode Power Supply with Dual + / - 5V and Design + / - 12V output, I have no idea where to start.

All the feedback loops that I should be confused about which components are used there, as they should be wired, what are you doing? I'm not sure that is) what kind of switch (transistor be used?

Any help in designing this circuit would be great!