kenr, I know you won't get this until Mon. Most people advise to start with two hives. If you haven't started, it's hard to explain why. First off, I can't tell the conditions in your bee yard. There are no absolutes until it's too late. But you can compare two hives and treat the weak one.
Also if (for some reason) the queen dies in one colony you can get larvae from the other to make another queen. Also swap frames of honey to feed a weaker hive. And if one were to die out, you could split the strong hive.
I know this sounds like a dire forecast but it's not really this bad. There are all kinds of things in between that can be done too. This is just to give you an idea why we say start with two hives.
Now, if some nicely mannered, handsome young man from Greensboro were to offer me one hive, I wouldn't say, "No, I need two." Seriously iddee's cool and will tell you how to get the second hive or else he could bee your second hive. Save you in emergencies, etc. Let us know how it goes.
Best of luck,
Hawk