From what you have said above sounds likw what i had been thinking when i first started roasting. Where do i start? Like many coffee related subjects on here i feel it come down to preference .I found working out what tastes and aromas i liked and putting that against the descriptions in the buying area and trying some that seem appealing.
There are alot of people on here with heaps of knowlage who may have a better way of going about it. but at the end of the day what appeals to you or what you are willing to try is what it comes down too.
About the Guatamela Huehuetenango, this seems to be a popular bean for many people. I too found it different however what i really liked about it was its clean feeling in the mouth.
Anyhow good luck and hope this has helped
PS. Each bean you get and try take note/s of it :)