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Donations is free and open, in the reports layout, it has some find and report examples you may find useful.
Here's a rough out line of a user friendly search method I put in a lot of my DB's:
Define a series of global fields for the user to enter search criteria. Place these fields on a dedicated search layout--sometimes I pop it up in a window--and add a button to trigger a search for the matching data.
In my script:
Enter Find Mode
Set Field [table::field; table::GlobalSearchField]
#repeat the above step for each search field, building search expressions such as Date1...Date2 or "< " & globalSearchfield as needed
#Turn off filemaker's "No records match..." dialog
Set Error Capture [Off]
Perform Find 
If [ Get (foundcount) = 0 ]
Show Custom Dialog ["No records match this criteria...]
#Do whatever you need to display the results of your find.
Thanks, David, for the resources! Heading over there now.
Thanks, Phil! I look forward to trying this out.