You mobo has connections for the system fans, near the edges of the board, look for them.
I don't quite get how you've hooked up the video card to "the same cable as the fans" the PCI-e connector for the board is discrete and unique. (Although it could be on the same cable as other types.
Again, not that it matters, but SATA "0" is where the HDD goes.
All 4 pin CPU connectors will contain 2 yellow wires and 2 black ones. Double that number for 8 pin.
Please don't get sloppy while you try to work this out. You could do damage if you don't maintain good anti-static work habits.