The answer depends a lot on what you plan to do with this new HDD.
Before going further, though, you need to be aware of one factor. All Windows versions by default will try to use any HDD in a particular way (called MBR Partitioning) that limits the maximum size of the HDD used to 2 TB. Beginning with Vista and Win 7, they also have the option to use an HDD larger than that under a different method called GPT Partitioning, but you have to tell it to do that. MORE importantly, if you actually plan to do this with a current Windows and a drive that large, your mobo BIOS also needs to have a feature called UEFI support, and you may need to set up this feature in BIOS Setup when using a drive that large. This applies no matter which way you plan to use your new drive (see below).
IF your plan is to continue to use your old HDD normally, booting and running from it, etc., and then only use the added second HDD unit for storage and retrieval of data, things are very simple. You can just install the second unit in your machine (I am assuming you have a desktop machine with enough space and connectors inside to do this) and then use Windows' utility Disk Management to Create a New Simple Volume on it that does NOT need to be bootable.
On the other hand, IF your intent is to replace the older HDD with a new larger one, there is more work to be done, but there are good tools to make it easy. What you need is a utility called a cloning program. Using that you can make a complete copy of your old HDD's contents to the new HDD, then remove the old HDD and connect the new one to the same mobo port as the old one was on. When you boot up after this, everything will look and work exactly the same, except that your C: drive will have a lot more space. At that point you also will have a spare HDD (your old one) that can be used for stuff. If this is the path you plan, post back here for a few more tips on cloning and drive replacement, and where to get cloning utility software.
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