If you've met the pledging prerequisites, you can download the Star Citizen launcher directly from the game's website. From there, you'll need to wait out the three GB patch before logging in to your personal hangar space where you can tour your pledge ships both inside and out.
System requirements for the module include eight GB of memory, a quad core CPU, and a DirectX11 capable GPU with at least one GB of onboard memory. Click through the links below for the hangar module FAQ. Pew pew!