I'm sorry. I don't own any Necchis. I'm not sure how different the hand wheel area is from other machines.
It almost sounds like it's still not assembled quite right. Also look for thread jams pretty much everywhere but especially in the bobbin area.
They happen a lot with younger sewers. They don't always remember to put the presser foot down before they start sewing.
I'm sure someone with more direct experience will be along.
Rodney