Put pheasant or duck scent on a tennis ball for playing fetch. Once he get's used to it throw it in cover so he can use his nose to find it.
I've been blessed with two "naturals" over the last 20 years.
Whatever you do don't play tug of war with him....I made that mistake on the current dog and she now like to parade with birds and doesn't give the bird up very easily. No problem with a goose but quail and huns ofter are worse for wear.
I'm no pro trainer so take my advice with a grain of salt.
Good luck.
Dave