Cerole Question??

I have a few questions partaining to ceroles.My first is , if i wanted make a baked ziti, i obviously mix the noodles with the meat sauce.My question is if i wanted to add white sauce(alfredo sauce) should i pour it over the top then add cheese or should i pour some noodles then some white sauce then more noodles and top with cheese?Also how would i freeze this, without or without the white sauce and also with or withour the cheese?Another question I have is can I freeze mac and cheese and then just defrost, add breadcrumbs and bake?Thanks for the answers