How do I replace all my speakers and stereo in my 89 vw rabbit?

I just bought a vw rabbit, and know nothing about cars, but it sounds like its pretty easy to change the speakers and stereo. Can anyone tell me where to start with this project? Aka, what type of speakers I should get, and how to replace them?|||when I had a vw rabbit I went to BAP auto store they had every thing I needed. here is ther web site





http://www.bapimportparts.com/index.html