Gearboxes or coupling noises

Hello everyone, I have a little problem. Mostly this is in the morning when the car has stood overnight and is cold. And that is when I start the car in the morning I make the idling in and let the car run for a short time before I start. As long as I hold the clutch everything is good, but if I let go I would say grinding, knocking mmm maybe also painting noises from the gearbox or the clutch. I think however transmission comes only when you get the Kup When you drive you hear nothing, really only in the stand and idle. If you have driven a few kilometers then the noise is almost gone in the stand. I would say that it sounds almost normal. Every now and then a quiet beat. Maybe someone had something similar and can tell me something about it. In the workshop I was already there the car was warm. He said it was all good and I could continue driving like this and I told him put the car there in the evening and he would test it in the morning. It is a Ceed Sw, petrol 1.5 liter with 140 hp and hand-operated. The car is 1.5 months old and has 2000 KM on the speedometer.