No problem.
Yes, what you said is correct.
If you buy the lite version of it you will get the serial rs232 cable with the ck3, and not the usb. Which is perfect in your case.
This is what you will be getting:
This is how the serial cable plugs in:
Then the other end of the serial cable goes into your computer.
As for the power, you will use the probe to power the drive, like this:
Now you plug the sata into the back of the drive, and connect the other end to your via card.
Now for the power, you should have these kind of connections in your pc: (look at the cable with the red, black and yellow wires)
Look in your computer for them, and look for any unused ones. If you do not have any, you will need to buy a splitter:
or you can see if you can pull a power supply from another computer and use it. Take a look at your drives in your computer, not your HDD's but your optical drives, see how they are powered. If its sata you can buy a sata to molex cable, and use that to power your ck3, if its ide, you can pull the power cable from the drive, and plug it into the ck3.