Hello,
The best location for assistance with ArcPad Studio, as far as documentation is concerned, would be to go to Start > All Programs > ArcGIS > ArcPad 10 > Developer Help > Customizing ArcPad. This documentation provides examples and explanations about the different types of controls on the Forms. Just type in the Search tab what you are looking for.
Also, for further assistance, I would recommend utilizing the ArcPad Samples. For the Redlands Sample, for example, you could open the Trees.apl in ArcPad Studio and be able to see how they set up their .vbs script and how they linked it with the Edit Form controls.
I hope this helps you out.
Thank you.