Hello Vegeta020, welcome to the submariners' world ! I recommand you to install a supermod before starting a career. GWX 3.0 is the most popular one :
http://www.thegreywolves.com/downloads/. For little mods, you should download a very good tool called JSGME :
http://www.subsim.com/radioroom/down...o=file&id=4653.
Good luck for your first patrol !
F.