getFieldText in nlapiLoadRecord

i want to get the estimate # and load it to another form by script.
i used the API of nlapiLoadRecord(type, id, initializeValues) and the getFieldText(name) and getLineItemField(group, fldnam, linenum) inorder to get the information i want.

What i want to get is to get the Estimate number, the date of Estimated, some custom body field in the Estimate, Items name in the Estimate, and some custom column fields in the Estimate

here is some of my script

function printQuotationPic(request, response)
{
var recId = request.getParameter('id');

var recEST = nlapiLoadRecord('estimate',recId);

        itemname = recEST.getLineItemText('item','item',1);

        itemproductionprice = recEST.getLineItemText('item','custcolprodprice',1);