If you are planning to install games to the Basic Wii U console, you should be ready to purchase an external hard drive. After system software and a user profile is installed, there will only be 3GB remaining on the Basic 8GB Wii U. That's enough to install New Super Mario Bros. U (2GB) but not enough for Nintendo Land (3.2GB) and many other launch titles.
Or, you can play games via disc, like a 2005 pleb. Is this where I leave a snarky comment about PC gaming?