Travel / Buying a Motorbike in Poland! Work Camp in Warsaw. [2]

Hi~

My name is SEONGDONG PAK, 21 years, from SOUTH KOREA.

I'm supposed to participate in WorkCamp in Warsaw this summer.

After WorkCamp, I'll have a trip from Warsaw to Madrid Spain by bike.(by 125cc scooter)

I have only 2 days for buying the bike, registering, insuring.

I wanna buy the USED scooter, and Sell again in Mairid after trip.

TELL me anything about buying, registering, insuring for a foreigner.

thank you!