Welcome to the world of chickens!
All chickens can be tamed, but many tame much easier and stay tame longer than others. generally the Mediterranean breeds are more flighty then breeds like cochins, brahmas or Plymouth rocks.
Buttercups are said to be a little flighty, but generally really sweet. They lay plenty of white eggs.
Dorkings are suppose to be very friendly and docile and they lay a good amount of white eggs as well.
Polish chickens lay white eggs, though they are bred more for their appearance than their laying ability. They are prized as pets.
Best of luck!