I honestly don't know the answer to that question as the first goal is to try a few cables and see where you are. Like you say you have to get it working properly first before you proceed, but logically, the proper cable hook up should achieve that.
May I suggest some online browsing or library visits to fill in the blanks of your knowledge about the functions of a computer and the devices you can add? Its difficult turning a Question and Answer site into a classroom lecture.
