Isn’t there self exploatory? You make array variable and you can do various operatiosn on it listed here:
I you want to loop thru there ForEach node (i can find it in Blueprint API refrence but it’s there) which works the same as While node, just loop for each item. There seem there no sorting utilities in blueprint exposed, probably because it hard to implement compare equalization in it, but you can do that in C++.
Also UE4 don’t use vector, it has it own implementation of containers, TArray, TMap, TPair, TSet, etc but only TArray is supported in blueprint… for now at least. here list of all C++ classes related to containers: