Has your breeder gave you all the relevant info on worming etc? The breeder wormed mine at 8 weeks so I was to worm at 10 weeks and 14 then every month until she was 6 month old- from then I worm every 3 months. 10 week old - weetabix & milk

When I picked mine up at 8 weeks she was fed on Eukanuba with a tiny portion of fish added to give the food scent- As Hannah says start adding a complete food to his diet and cutting out the weetabix- then you should eventually have a dog that is fed only on complete dog food. At 10 weeks old your pup probably wants a little over 200 grams of complete split between four meals:)
Stacey x x x
Edited to add worming details