Thanks for the replies. My idea was to start this game, and run it parallel to doing other tutorials, so, when i get stuck at a point, find a tutorial on the subject, complete it and then adapt it to my game.
The actual game itself is set in a space ship overrun by baddies. You command a group of people, and you have to survive. I think i will make it in 2D and use an isometric view. At this stage, i want to make a room, and have some goodies and baddies shooting each other. I have lots of features i want to add, but they are for a far distant future. Im using XNA and c#.