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It's 100% normal.
When you're sitting there with car in neutral and your foot off the clutch, the clutch is engaged with the flywheel, and the input shaft of the transmission is spinning. Power doesn't go all the way through, obviously, because the transmission is not in gear.
When you push in the clutch, you disengage the clutch from the flywheel, so power is no longer being applied to the transmission input shaft. If you hold the clutch there for a few moments without doing anything else, the input shaft will slow down and stop.
However, if you immediately put the car in first gear right after pushing the clutch, before the input shaft stops spinning, the momentum of the spinning shaft will try to spin the rest of the drive train. You get a little bump all the way back to the differential as the gear in the transmission stops the input shaft's momentum. That's the clunk you're hearing.
It's normal. It doesn't hurt anything. If it bothers you, just leave your foot on the clutch for a moment before putting it in gear, and you won't hear it.
This is probably not the weirdest thing about this car. You will also find other things that may alarm you but are perfectly normal.
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