Those are good products to start with. As you get more comfortable with the game, and the various aspects of it, you can then expend your collection to cover the supplemental books. Those supplements include expanded rules for Magic, Combat, and the matrix, as well as providing more options for character creation, gear (Cyber, guns, magic, matrix).
Shadowrun is a very complex game (no point in hiding it), so take the time to read the book through a couple of times. If you have any questions or concerns, feel free to ask on the forums or browse the forums for your answer (lots of stuff has been discussed!).
For the most part, we have a good group of players, and freelance writers to answer your questions!