As a FileMaker Pro database developer, you're already familiar with many of the concepts necessary to develop with 4th Dimension. Hopefully this document has demonstrated the similarities and explained the differences between the two products.
So study the code behind the 4D Orders database a little closer, then start with one of the 4D Templates to create your own custom database. We think you'll find that adding 4th Dimension to your arsenal of database development tools will give you the flexibility to provide a wider range of solutions.
4th Dimension for the FileMaker User
FileMaker Pro to 4th Dimension Quickstart Guide
Download the Example Databases for Windows