Hi
Once you have it installed as a second hard drive you should be able to format it in Windows Explorer if it's recognized by Windows without any problems.
In a desktop the connections you need are likely to be there already.
There is usually an extra power cord from the Power Supply and an additional connection on the main Cable that connects to your existing hard drive.
The easiest way to find out is to open up the case and look.
You could also buy and external adapter and use the hard drive as an external hard drive that plugs into a USB port.
Something like this...
StarTech.com 3.5in Black USB 2.0 to IDE SATA External Hard Drive Enclosure Storage enclosure- IDE / Serial ATA-300
Mike