Dumerils-Feeding advice

[KWenger]

I received my male Dumerils yesterday and he seems very healthy. He was shipped cross country from Los Angeles to my home in North Carolina and arrived in great shape. I'm not sure of his exact age, but I think he is about a year old. Apx. 4 feet long and he weighs 564 grams. How often should I feed him? What is an appropriate size prey item? I have a quantity of frozen weaned rats (ave weight 50 grams) and also frozen med. rats (ave weight 150 grams.) What would you recommend for his feeding schedule? Should I feed him in his cage or remove him to a feeding box? I'm thinking one weaned rat might be too little for a meal, but is a 150 gram rat too big for him? I've got experience with BPs and corn snakes, but this is my first Dumerils. Advice would be appreciated. Thanks!