Where to start.
If you really want to understand this music you have to understand clave. It is the rhythmic base of every note that is played (or sang) in Son/Salsa. Here's a
page that is bass oriented. You can find more with google. You can enjoy the music without knowing this but if you want to play it you have to learn how to feel clave.
Timba is where Son meets Funk, Rock, and Hip Hop. Check out
Timba.com for a good taste.
Buena Vista Social Club is cool, but there are a couple of things that Ry Cooder's son does on there that makes me want to cringe.