Add layers and rename "Layer 1" layer to "Text"

layerNames.jsx

var d = app.activeDocument;

layerNames();

function layerNames() {
    // layer options
    var layerImage1 = d.layers.add({name:"Images", locked:true, layerColor:UIColors.BLUE});
    var layerGuides = d.layers.add({name:"Guides", locked:true, layerColor:UIColors.GREEN});
    var layerBookline = d.layers.add({name:"Bookline", locked:false, layerColor:UIColors.RED});
    // var layerImage2 = d.layers.add({name:"Images - Below", locked:true});

  // rename Layer 1 to Text
	if (d.layers.itemByName("Layer 1")){
		d.layers.item('Layer 1').name = 'Text';
	} else {
        return;
    }
	
	layerImage1.move(LocationOptions.AT_BEGINNING);
	layerGuides.move(LocationOptions.AT_BEGINNING);
	layerBookline.move(LocationOptions.AT_BEGINNING);
	// layerImage2.move(LocationOptions.AT_END);
     
}