Hi, i just received my dry starter from Graham in the post. In the insturctions is tells me to feed the start at least once initially before baking. It provides qtys of making 350g of starter dough, therefore if i need 350g of starter dough in the recipe do i need to make 400g of starter dough so that i have 50g remaining to feed and keep the starter going for the next loaf. In terms of feeding if i keep 50g of starter do i add 100g water and 100g flour. I am confused- any direction on how to activate and them keep the starter going would be appreciated.