Hi, I am not quite sure on a couple of things,

First is how to wire in an electric cooling fan

Second is how to wire in the LED's for the ignitors, I have the resistors, but what else do I need to do?

Third is how to wire the CAS G+

I read the FAQs and searched and that has helped me this far. I have a V3.0 board, with modified CAS thanks.

 

I would also like to know how to wire the CAS G+ and a 6port solenoid in, all I need for this is the solenoid activation.

 

The wiring CAS and ignitor wiring is documented pretty well in the FAQ. For electric fan, 6-port solenoid, and any other aux. output, take a look here:
http://megasquirt.sourceforge.net/extra/outputs.htm
Roger.