Hello,
There is a new "for each key with value in dictionary" block that is in the works that should allow you to create a sort function more easily.
For now though you can use something like this to access the items in your dictionary:
(picture courtesy of @ewpatton)
As for the actual sorting, there should be something on the List FAQ that can help you there. This sorting tutorial looks like it might fit the bill.
I hope that helps!
--Beka