Found the NS website, which has some cool features. You can check precise schedules from Schiphol to Centraal Station
HERE. Just type "Schiphol" in the "From" box and "Amsterdam Centraal" in the "To" box. Select date and time, and get a complete schedule, including departure track number. Great for me, since I don't want to f up and find, board the wrong loco, and myself in Germany or some such thing.
Here's the cool part: you can practice purchasing a ticket from the kiosk with
THIS on-line example. If you're a Yank like me, remember to click the Union Jack at the bottom for English.
Train's a great deal for Euro 3.90 one way. Only takes about 20 minutes, and I understand the station is directly below Schiphol.
PM Me If Links Dead, Please.