In which one of those ports i need to plug sata cable in ? https://imageshack.us/i/pmo7OYDapWhat you need to plug in will completely depend on the rest of your system and the cables of the PSU.
You will want SATA ones from storage drives and optical drives.
You will want the PCIe for GPU and any other potential PCIe expansion cards.
8pin port is for pci-e ,yes?Edited above.
I believe all 6 pins can be used anyway. But regardless you should find the cables are "keyed" so you can only insert them into the correct ones.
I believ yours comes with 1 CPU cable, and 3 Peripheral/SATA cables, thus why i believe it is all 3 6 pins you can use.
PCIe/CPU8pin port is for pci-e ,yes?