As you have enough equipment (four hives), I would suggest starting with two or even three hives. As a beginner you will learn faster and be better able to detect potential problems and recognize unusual behaviour by comparing hives. Additionally it does give you the opportunity to fortifiy a weaker hive with brood from a stronger hive should the need arise. Also if next year is anything like this year order your bees early (Feb.) as the demand outstripped the supply this year. Good luck.