You have your Business Operation class so you can ignore the X12 Output and Workflow tabs. Those are helpers for cases when you're using built-in Operation classes.  They help you select the right class even when you don't know its name.

Your code references your Adapter, so there's nothing you need to do in this wizard to select EnsLib.NullAdapter. The code is also where the Request and Response classes are specified, so you don't need to do that here either.

You can give it a meaningful name, or you can leave that blank and the class name will be used for the Operation name.

After adding this Operation to your Production, take a look at its settings.  You may want to adjust things like Pool Size.

You could use a Record Map with a single field. Just make sure you set MAXLEN to a big enough value to hold the entire line.  That would send each line in the file to your Process as text, ignoring that it's actually JSON.  Your Process could convert it to a Dynamic Object if necessary.  That doesn't seem to add much value over just having your Process read the file though.