Hi Matt, There are many beans to choose from... My personal advice would be to go through the selection of what is available and pick which ones take your fancy. When you receive them i would roast each bean by themselves. Give them a couple of days and start trying them (even straight after you have roasted if you cant wait a few days) Take notes of tastes and how they change over the week. After that i would start blending beans together which you think would go well with other beans.
You will find that some or most beans go well on their own as a Single Origin (SO) in some sort of way.
Mind you if you wish to blend straight ways thats cool also. I like many like to taste SO beans first.