In the lite-C manual under "External Languages" you'll find a description how to write plugins for lite-C - if that was your problem.

For any questions related to visual studio you can get help in the "higher languages" forum. However you should then give a little more details. It is not clear from your post what you're doing at all - writing an engine plugin, or using the engine in another application, or whatever - and what your problem really is. As the free lite-C version can not publish, you can not implement its engine in other programs. This is only possible when you own Gamestudio.