First C# Program- Need a Little Help

Question

Hey. I'm working on my first C# program, and I really haven't read any tutorials or anything like that...which means that my code is probably a HUGE mess... The program is a text-based game, and currently only the basic combat system and a demonstration of said system has been written, but I'm really worried that it may be "written incorrectly." I've merely written what has made it work without any research into anything. So... =/ That said, I'd really appreciate anyone's help if they'd like to look at the code and tell me what's wrong and how to go about fixing it. All in all, it's currently 309 lines...but a decent bit of that is stuff like output for the end-user and the like... Help...please. :(