Go to MSDN website and download the intorduction to 3d games in C#, you might need to change the file format over to Direct X to get it to work, although I think you can get a free converter form obj to direct x but it will guide you through the [rocess of creating a game.
Then have a look into XNA, its free and works as a plug in for C#.
"No pressure, no diamonds" Thomas Carlyle