Once you have a good understanding of Anchor Buoy, check out "selector connector" as developed by both SeedCode and GeistInteractive. It's an advanced form of Anchor Buoy.
You can also consider data separation:Convert to Seperation Model
You might also check out the Adventures in FileMaking series. Adventures 1 and 2. They are free to download.
Adventures in FileMaking #1 - Conditional Value Lists (includes details on how to set up a basic field based value list)
Adventures in FileMaking #2 - Enhanced Value Selection (what to do when a simple value list won't cut it.)
These really aren't "getting started" files, but they can serve as useful resources as you work out the interface design you want to use for your solution.