If more energy is required to break the bonds in the reactants than to make the bonds in the products, is the reaction exothermic or endothermic?

It's an endothermic reaction. It's because breaking bonds absorbs energy and making bonds releases energy to the surrounding. Total energy change = Energy required to break bonds - Energy released making bonds. If more energy is absorbed than released, that means the overall energy change is positive --> endothermic.