StyleD,
Try this video. It helped me out when just starting out.
The slap and note come at the same time.
Justin's video alternates.
http://www.youtube.com/watch?v=L_AXlHOXhCc
There are others on u-tube, but this one show get you started.
Tab it out and you will be able to follow it a little better. You won't have to try and keep up with the dude on the video.
nw