Turbo

I drove for about 80kms stopped and then restarted the car after 1 minute to be greeted with clouds of smoke from the exhaust

My laguna has an oil leak,I have been told from the turbo,is it a hard job to change the turbo and how do I order a new one

Every one I have contacted want the no off the old turbo and it is impossible to see a no unless I take the turbo off

Help please

It does smell of burnt oil oil when you stop

Thanks

Dave