he's only 8 weeks so he's going to take a while to housetrain him... really your just going to have to PRAISE HIM LIKE CRAZY when he goes outside..... treat every outdoor pee and poo like its more important then the queen
if you need to, if you catch him going in the house during the act just give him a firm yet gentle no (only if you catch him in the act) and then immediately take him outside. since the outdoor world can be big and scary to an outdoor pup, try to take him to the same place with the fewest distractions possible good luck and pls post some pics......
Im sure other people here would have some more and better advice for you.