metal core at back coz it can take more weight there and spoked at front coz they're good front runners except before you put the metal core on the back you need to ride it for a bit on the front to wear it in
if you have a park near by just put it on the front and sesh for a bit or you could go down a bitumen hill a few times and do some tricks just do what you'd normally. Ride it for about 1 hour or two at the skate park or 30 min-1 hour bitumen.