If you just want to install Windows 8 and have one 2 TB Drive, usually the "C" drive then you have one partition. There is a hidden 100MB boot partition, but you won't see it or need to do anything with it. It is automatically installed and hidden to the user. However, you may very well want to partition your 2 TB drive just to make things more organized. If I were doing this, I would set up a 100 GB partition for my OS and all my primary programs, but not games. Then I would partition another 500 GB for games, 200GB for pictures, 400 Gb for Movies, 100 GB for general personal files and 200 GB for music. Each of these partitions would have it's own drive letter ( they do not have to be in order! ) I would leave the remaining amount un-formatted until needed.
If you want to do this ahead of time put the drive in another computer or an external enclosure and go to DIsk Manager. Go to the Drive and right click on the rectangle that represents the drive and choose format. Follow the instructions. WHen it asks how big you want it, choose an amount smaller than the total to create that partition size. You will be asked what partition letter you want too! If you screw it up a bit, you can delete partitions or volumes and do it over again. Then take it out and install it into your computer and put the disk in and install Windows 8 on the first partition! IF you don't want to partition, you don't need to do anything. THe windows disk will format the 2TB disk for you and install the OS all at once!