In 10-12 months when they are mature and you know which are boys and which are girls, you can write back and ask more specific questions.
White will always be unpredictable. Unless paired to gether, then you should get all white.
Black X buff will get you buffs, blacks and mixes. The buff offspring will probably have too much black in their wings/tails. For clearer buffs you need to breed the buff to the buff.
Black X partridge will give you partridge.
Buff X partridge will give you partridges who are too yellow or buffs with a lot of smutty undercolour.