Advise needed on 9week old girls please

I have just been given 3 home bred girls 9 week old.x2 Welsummers and 1 black rock. The person who they came from said he was feeding corn but should they not be on a proper feed? How much do they need?I had POL before so am not sure as know they are too young for layers. Should it be growers and if so do they need suppliments in their water? I used a saeweed one before to help my girls when they were laying. How often do I worm them and what do you advise. Last question they have not been vaccinated, does this mean they have to be thoroughly cooked,their eggs that is! Many thanks for any help, I am anxious not to get it wrong as they are bright active klittle things very healthy at mo

Thanks for advise.Have just bought some growers.Any advise on other questions much appreciated

As to vaccination many people dont vaccinate as you really need to buy the vaccine in large quantities and the vets dont really want to. I have mine half and half because o where i got them

Remember not too many treats or they wont lay well.

Enjoy your new girls. I have 12 just at nine weeks and they are toerags lol