Can you rephrase that question? It's a little unclear. Are you asking how to use Service Builder in general, or have you done it before but just need advice on using Netbeans?
If you've never worked with Service Builder before your best bet is to run the builder ant script using the command line in the Liferay SDK. You can then import that into your IDE (You will have to run the script again when you implement your impl methods, though.)
If your IDE has the Liferay plugin (Like Eclipse Helios) you can run the build script within the IDE and make life easier. Don't know if Netbeans has such a plugin but if it doesn't you're better off using the command line ant tool for this part.
