Hi
1) I already draw the schematic for the design.However in the schematic i need to put 2 header(2 pin) for my supply voltage (9-12V) and analog input signal (0-5V) respectively.I could not find this component in the library.What should i do??
2) When I convert the schematic to PCB, what should i do to ensure that my board is double layer and through hole. I already go through the guided tour and tutorial but still can't figure it out.

1. Create a pattern for the header in Pattern editor, create a component with 2 pins and attach the pattern for it in Component editor. Add the component in schematic 2 times and connect them to nets as you want.
2. By default, new board is double-sided. In any case, you open layer setup and check number of layers. It depends on you whether through-hole or surface mount board you will get.

ps. Why did you created the topic in bug report thread?