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.